Calibres, FAC Power and Accessories for the FX DRS MKII System

The FX DRS MKII System has been developed to provide a wide selection of configurations for precision target shooting, competition and lawful field use. Available calibres, barrel lengths and power levels can be matched to different requirements, while the modular platform allows compatible accessories to be added as the shooter’s needs develop.

Available Calibres

Depending on the selected Classic, Tactical or Pro configuration and regional availability, the rifle may be supplied in 4.5 mm (.177), 5.5 mm (.22), 6.35 mm (.25) and 7.62 mm (.30) calibres. The inclusion of .30 calibre represents an important expansion of the MKII range, although not every calibre is necessarily offered with every stock, chassis or barrel-length option. The chosen specification should therefore be confirmed before an order is placed.

4.5 mm (.177) is generally selected for precision target shooting, economical practice and applications where a flatter trajectory is valued. Because lighter projectiles are normally used, a higher shot count may also be obtained from the available air supply. In a sub-12 ft-lb configuration, .177 can be particularly appealing to shooters who want an accurate and efficient rifle for range use.

5.5 mm (.22) offers a practical balance between projectile weight, energy, air consumption and trajectory. As a result, it remains a popular all-round choice. It can be configured for economical sub-12 ft-lb shooting or supplied in higher-powered form where an appropriate certificate and local authorization are held.

6.35 mm (.25) is designed for shooters who prefer heavier projectiles and greater retained energy. This calibre is commonly associated with full-power configurations and may be particularly suitable for longer-range target disciplines or lawful field applications. However, additional air will generally be consumed with each shot, so the expected shot count may be lower than that of a comparable smaller-calibre setup.

7.62 mm (.30) provides the greatest projectile weight and energy potential within the current DRS MKII range. It can be chosen for specialized precision shooting and other legal applications where a powerful air rifle is appropriate. Because this calibre places greater demands on airflow and air capacity, the improved power plenum, APB barrel system and Dynamic Block barrel inlet become especially valuable.

The manufacturer currently lists all four calibres for the FX DRS MKII Tactical and FX DRS MKII Pro. Nevertheless, availability can vary by country and retailer.

Sub-12 ft-lb and FAC Configurations

Both Sub-12FPE and FullPower versions are identified within the official range. In England and Wales, an air rifle capable of producing muzzle energy above 12 ft-lb must be held on a valid Firearm Certificate. Consequently, a full-power model should only be purchased, possessed and used by someone who has the required authorization.

A rifle producing no more than 12 ft-lb may generally be owned without a Firearm Certificate in England and Wales, subject to age restrictions, prohibited-person rules and other applicable laws. Different requirements apply in Scotland and Northern Ireland. Buyers outside the United Kingdom must follow the laws of their own country, state or region. Current guidance should always be confirmed with the relevant licensing authority before purchasing or modifying the rifle. These limits are explained in the UK Government’s official air-weapons safety guidance.

A sub-12 ft-lb version can provide excellent efficiency, reduced air consumption and a useful shot count. Meanwhile, an FAC-rated configuration allows the upgraded airflow system and larger-calibre options to deliver substantially greater performance. Exact muzzle energy will vary with the calibre, model, barrel length, factory specification and projectile being used. Therefore, one universal power figure should not be applied to the complete range.

Any tuning must be completed within the law and according to FX instructions. Increasing regulator pressure, altering the hammer setting or replacing internal components may change the rifle’s legal classification. Where a certificate is required, the authorized calibre and rifle details must correspond with the conditions recorded on that certificate.

Power Delivery and Efficiency

Improved power potential is supported by the redesigned plenum and optimized Dynamic Block barrel inlet. A controlled volume of regulated air is released efficiently, allowing consistent velocity to be maintained across the usable portion of a fill. Additionally, the AMP MKII regulator helps stabilize the pressure delivered for each shot.

Different barrel lengths may also influence efficiency and achievable velocity. A compact configuration offers easier handling, whereas a longer barrel can provide additional time for the expanding air to accelerate the projectile. Nevertheless, higher velocity does not automatically guarantee better accuracy. The most suitable balance between projectile weight, regulator setting, barrel length and energy should be selected for the intended application.

Recommended Accessories

A quality riflescope is one of the most useful additions. The standard 30 MOA Picatinny rail provides a secure mounting platform and preserves more scope elevation for longer-distance adjustment. Suitable Picatinny rings should be selected, with enough clearance being left for the magazine and objective lens.

Additional compatible accessories may include:

• Mini or Mega magazines in the correct calibre
• A single-shot loading tray where available
• Spare fill probes and replacement sealing O-rings
• A suitable PCP hand pump, compressor or diving cylinder
• A rated fill hose with an accurate pressure gauge
• Picatinny-compatible scope mounts and optical sights
• A bipod, shooting rest or competition support system
• M-LOK accessories for compatible Tactical and Pro handguards
• Quick-detach sling fittings and a suitable rifle sling
• An approved hard case or padded rifle bag
• FX-compatible barrel liners and calibre-specific components
• A legal, correctly threaded sound moderator where permitted
• Manufacturer-approved maintenance supplies and cleaning equipment

Only accessories intended for the exact MKII model and calibre should be installed. High-pressure components, barrel parts and internal tuning accessories should be fitted according to official instructions, preferably by an authorized FX technician. When the correct calibre, legal power category and supporting equipment are selected, the FX DRS MKII System can be configured as an exceptionally capable and personalized precision air-rifle platform.

Frequently Asked Questions

What is the FX DRS MKII System?

The FX DRS MKII System is the second generation of FX Airguns’ modular DRS pre-charged pneumatic platform. It has been designed to combine a slim, familiar rifle profile with advanced air-management and barrel technology. Compared with the original platform, its airflow, barrel interface, power plenum and overall versatility have been refined.

Several configurations are available, including Classic, Tactical and Pro models. Therefore, traditional styling, tactical adaptability or competition-focused adjustability can be selected without leaving the main DRS platform. Available features and specifications may vary according to the selected model, caliber, barrel length and regional power restrictions.

What does DRS mean in the FX rifle range?

DRS refers to the Dynamic Rifle System used by FX Airguns. The concept is centered on a streamlined architecture in which the air reservoir is positioned around the barrel. Consequently, the rifle can retain a slim exterior profile instead of relying on a conventional bottle or large cylinder positioned beneath the barrel.

This arrangement has been developed to provide comfortable balance, efficient use of space and a more traditional handling experience. At the same time, the advanced performance expected from a modern regulated PCP air rifle is maintained.

What is new about the MKII version?

Several important improvements have been incorporated into the second-generation platform. A new APB barrel system has been installed, while the Dynamic Block barrel inlet has been refined to optimize airflow. An improved power plenum has also been introduced, allowing increased efficiency and greater power potential to be supported.

Furthermore, the barrel-to-action interface has been strengthened through tighter tolerances and upgraded materials. A 30 MOA Picatinny scope rail is now provided across the platform, and caliber compatibility has been expanded to include .30-caliber configurations. These upgrades are intended to improve consistency, versatility and long-term performance.

How accurate is the FX DRS MKII?

A high level of accuracy can be achieved when the rifle is properly configured and used with a suitable projectile. Its regulated air delivery, refined barrel interface and upgraded APB barrel system have been developed to promote dependable shot-to-shot consistency.

However, accuracy will also be affected by projectile selection, velocity settings, atmospheric conditions, optic quality and shooter technique. Before a final setup is chosen, several compatible pellets or slugs should be tested safely at the intended shooting distance. The most consistent option can then be identified for the individual rifle.

What is the APB barrel system?

The APB barrel system is an upgraded barrel arrangement introduced on the MKII platform. It has been engineered to provide improved precision, dependable alignment and greater projectile versatility. It works together with the refined Dynamic Block barrel inlet, through which air is delivered more efficiently to the projectile.

Because different calibers and barrel lengths may be offered, the exact barrel specification should be confirmed before purchase. Any barrel adjustment, caliber conversion or internal modification should be completed according to the manufacturer’s instructions or by a qualified technician.

What is the purpose of the improved power plenum?

The power plenum stores a controlled volume of regulated air that can be released when the rifle is fired. By increasing and refining this component, stronger airflow and improved efficiency can be supported. Greater performance potential may also be accessed when heavier compatible projectiles are selected.

Nevertheless, maximum power is not always the best setting for every application. Accuracy, efficiency, projectile stability and legal energy restrictions should be considered together. Any adjustment should remain within the manufacturer’s specifications and the laws that apply in the owner’s location.

Is the FX DRS MKII regulated?

Yes. The platform is equipped with FX regulator technology, including the AMP MKII regulator on applicable configurations. The regulator is used to control the pressure delivered for each shot. As a result, velocity variation can be reduced and more predictable performance can be maintained throughout the useful portion of the air fill.

Regulator settings should not be changed casually. If tuning is permitted on the selected model, the correct procedure should be followed carefully. Unauthorized adjustments may affect reliability, accuracy, warranty coverage or legal compliance.

Which calibers are available?

Depending on the model and market, configurations may be offered in .177, .22, .25 and .30 caliber. Not every caliber, barrel length or stock option will necessarily be available from every retailer.

A caliber should be selected according to the intended lawful use. Smaller calibers may be preferred for target shooting and efficient shot counts, while larger calibers may be chosen where additional projectile weight or energy is legally appropriate. Before ordering, the exact product listing should be checked to confirm caliber, barrel length and regional power specification.

How many shots can be obtained from one fill?

The total shot count will depend on the caliber, barrel length, power setting, reservoir capacity, regulator tune and projectile weight. Consequently, one universal shot-count figure cannot accurately represent every available configuration.

A lower-powered .177 or .22 setup may generally provide more usable shots than a higher-powered .25 or .30 configuration. Temperature and fill pressure may also influence performance. For the most reliable estimate, the specification supplied for the exact model should be consulted.

What is the recommended fill pressure?

The maximum and recommended fill pressure should always be taken from the markings on the individual rifle and its official manual. A compatible filling probe, clean dry air source and properly rated equipment must be used.

The marked maximum pressure should never be exceeded. Before filling begins, seals, hoses and connectors should be inspected. Filling should then be completed gradually so excessive heat is not generated. If damage or leakage is suspected, the rifle should be depressurized only through an approved procedure and inspected by a qualified service professional.

What is the difference between the Classic, Tactical and Pro?

The Classic is designed for shooters who prefer familiar sporter-style handling. Depending on availability, synthetic, walnut and adjustable laminate stock options may be offered. A slim profile and comfortable balance are emphasized.

The Tactical is built around greater accessory compatibility and configuration flexibility. Its chassis-style format may be preferred when adaptable mounting space and modern ergonomics are desired.

Meanwhile, the Pro is intended for precision and competition-oriented use. More extensive adjustability, match-focused ergonomics and a stable chassis arrangement are provided. Although the underlying MKII technology is shared, the external features and intended experience differ.

Does the rifle come with a 30 MOA scope rail?

A 30 MOA Picatinny rail is included across the current MKII platform. The built-in incline allows additional scope-elevation adjustment to remain available, which can be beneficial when an optic is being configured for extended distances.

However, scope rings must be compatible with a Picatinny rail, and sufficient clearance should be provided for the objective lens and magazine. Because the rail is inclined, the optic’s usable adjustment range and the intended zero distance should also be considered during setup.

Can a sound moderator be fitted?

Moderator-ready configurations are available. However, thread dimensions and included muzzle components may vary according to the model, caliber and market. Compatibility should therefore be confirmed with the retailer or manufacturer before an accessory is purchased.

Furthermore, ownership and use of moderators are regulated differently between countries and regions. A compatible unit should only be installed where it is legal, and local requirements should be checked beforehand.

What type of magazine is used?

FX magazine options, including Mini and Mega formats on applicable configurations, may be supported. The Mini magazine offers a lower profile, which can allow an optic to be mounted closer to the bore. Conversely, a larger magazine may be selected when increased capacity is preferred.

Magazine capacity will vary by caliber. Only ammunition of the correct type, diameter and suitable length should be loaded. If resistance is encountered, the magazine or action should not be forced because damage or an unsafe obstruction could be produced.

Can pellets and slugs both be used?

The barrel system has been developed to offer useful projectile versatility. Therefore, compatible pellets and purpose-designed airgun slugs may be tested where appropriate for the selected caliber and power level.

Nevertheless, every projectile will not perform equally well. Diameter, weight, shape and velocity can significantly influence accuracy. Several suitable options should be evaluated safely, while reliable feeding and stable grouping are observed. Manufacturer recommendations should always be followed.

Is the trigger adjustable?

Trigger adjustment is provided on relevant configurations, although the available settings may differ between the Classic, Tactical and Pro versions. A clean and predictable trigger break can help reduce disturbance as each shot is released.

Any adjustment must be completed with the rifle unloaded and pointed in a safe direction. An excessively light or incorrectly set trigger may become unsafe. If the procedure is not fully understood, the work should be performed by an authorized technician.

Is the FX DRS MKII suitable for beginners?

The rifle can be used by a properly supervised and legally eligible new shooter, but it is primarily a premium platform with features that may be better appreciated by an experienced PCP owner. Filling equipment, pressure management, optic setup and routine maintenance must all be understood.

A beginner should receive qualified instruction before use. Safe muzzle control, secure storage, correct loading and an appropriate backstop must always be prioritized. Local age limits, licensing rules and energy restrictions must also be observed.

Is it suitable for competition shooting?

Yes, especially when a competition-oriented configuration is selected. The Pro model has been developed for shooters who value adjustability, balance and consistent performance. Its chassis, match-focused layout and 30 MOA rail make it particularly suitable for precision disciplines.

The Tactical and Classic models may also be used for target shooting, depending on the rules of the event. Before entering a competition, caliber, power, weight and equipment restrictions should be checked carefully.

Can the rifle be used for hunting or pest control?

Where legally permitted, an appropriate configuration may be used for lawful hunting or professional pest-management applications. However, the selected caliber and energy level must be suitable for the intended quarry, distance and local regulations.

Ethical use requires accurate range estimation, dependable projectile performance and a clean shooting position. Adequate competence should be demonstrated before any live quarry is considered. Permission, licensing requirements and seasonal restrictions must also be confirmed.

How should the FX DRS MKII be maintained?

The exterior should be wiped with a soft, dry cloth after use, particularly when moisture or fingerprints have been deposited. Manufacturer-approved lubricant should be used only where instructed. Excess oil should not be placed inside the air system or barrel.

Additionally, seals, the filling probe and magazine should be inspected periodically. The bore should only be cleaned with equipment appropriate for an air rifle. Internal regulator, valve or high-pressure repairs should be completed by an authorized service center.

How should the rifle be stored?

The rifle should be unloaded, uncocked and secured in a locked location that cannot be accessed by children or unauthorized individuals. Ammunition should be stored separately where required by law. A dry, temperature-stable environment should be selected to help prevent corrosion and seal deterioration.

Before storage, the manufacturer’s advice regarding residual air pressure should be followed. The rifle should never be stored with a projectile loaded or the trigger mechanism under unnecessary tension.

What should be checked before placing an order?

The exact model, caliber, barrel length, stock or chassis configuration, regional power output and included accessories should be confirmed. Magazine type, filling connector, optic requirements and local legal restrictions should also be reviewed.

Practical Use Scenarios for the FX DRS MKII System

The FX DRS MKII System has been created for shooters who require more than a single-purpose air rifle. Its modular construction, regulated performance and selection of Classic, Tactical and Pro configurations allow the platform to be adapted to several practical shooting environments. Whether a relaxing afternoon is being spent at a local range, a demanding competition is being entered or lawful pest-management work is being completed, an appropriate configuration can be selected.

Although advanced technology has been incorporated, everyday usability has not been overlooked. A smooth side lever, balanced profile, adjustable trigger and dependable magazine system are provided to make repeated operation feel controlled and predictable. Meanwhile, the APB barrel system, improved plenum and refined Dynamic Block barrel inlet are used to support accuracy and efficient air delivery.

Recreational Target Shooting at the Range

A straightforward range session is one of the most practical ways in which the rifle can be enjoyed. Paper targets, approved reactive targets and formal club layouts can all be used to develop accuracy, breathing control and trigger discipline. Because the AMP MKII regulator is designed to stabilize the air pressure delivered for each shot, consistent performance can be maintained throughout the useful portion of a fill.

For general target practice, a .177 or .22 configuration may be particularly convenient. A .177 rifle can provide economical shooting and a relatively flat trajectory at common airgun distances. Alternatively, .22 calibre can be selected when a slightly heavier projectile and a more versatile setup are preferred.

Before the session begins, the rifle should be inspected, filled to the manufacturer-approved pressure and fitted with the correct magazine. A suitable backstop must be present, while eye protection and all range rules should be observed. Once the rifle has been safely prepared, a stable zero can be established at the intended distance.

From that point, groups can be fired in controlled strings. Notes may be recorded regarding projectile type, group size, fill pressure and environmental conditions. Through this structured approach, the most consistent pellet or slug can be identified without unnecessary changes being made to the rifle.

Precision Practice from a Bench

Benchrest shooting provides an ideal environment in which the platform’s mechanical consistency can be evaluated. With the rifle supported by a suitable front rest or bipod and rear bag, much of the movement introduced by the shooter can be reduced. Consequently, differences between projectiles, optic settings and rifle configurations can be observed more clearly.

A high-quality scope can be mounted on the 30 MOA Picatinny rail. Proper eye relief should then be established, and the reticle should be leveled before the mounts are tightened to the recommended specification. Parallax can be adjusted for the target distance, while magnification should be selected according to the conditions rather than being set unnecessarily high.

Five-shot or ten-shot groups may then be completed with a consistent technique. The same shoulder pressure, grip and trigger contact should be maintained throughout each string. Additionally, enough time should be allowed for careful aiming so that each result reflects the rifle and projectile combination accurately.

Bench practice can also be used to monitor velocity consistency when a chronograph is safely installed according to its instructions. However, internal settings should not be altered without a clear understanding of their effects. The factory configuration will often provide the most dependable starting point.

Field Target and Hunter Field Target Practice

A lightweight and naturally balanced Classic configuration may be well suited to field-style target courses. During these activities, targets are engaged from a variety of permitted positions and distances. Therefore, balance, optic clarity and repeatable handling become just as important as mechanical accuracy.

When a course requires standing, kneeling or supported shots, the rifle’s slim profile can help it settle naturally into the shooter’s position. An adjustable cheek rest, where included, can be fitted so that consistent eye alignment is achieved. Likewise, the recoil pad and trigger reach can be configured to promote comfortable placement.

Range estimation and trajectory knowledge can be developed through repeated practice. Instead of relying on guesswork, verified holdover or scope-adjustment information should be recorded for the chosen projectile and power level. Wind indicators may also be observed so that the effect of changing conditions can be understood.

A sub-12 ft-lb configuration can be particularly relevant for disciplines governed by that limit. Nevertheless, competition regulations differ, and the rifle’s eligibility should be confirmed before an event is entered.

Precision Rifle and Positional Competition

For competition-oriented use, the Pro configuration provides a highly adjustable foundation. Its MDT Elite chassis, match-focused trigger and carefully considered balance allow the rifle to be adapted to different body dimensions and positional requirements. The platform may therefore be prepared for stages involving barricades, benches, tripods or other approved supports.

Before an event, the cheek rest, length of pull, grip position and optic placement should be adjusted. These settings should then be left consistent so that the same head and shoulder position can be reproduced. Magazine function should also be checked with the chosen projectile before competition day.

During a positional stage, the rifle’s balance can help reduce fatigue while transitions are being made between approved shooting points. The smooth side lever allows the action to be cycled with limited interruption to the established position. Meanwhile, a Mini magazine can help an optic to be mounted lower, whereas a Mega magazine may be preferred when additional capacity is required.

The 30 MOA rail can be useful when greater elevation adjustment is needed for varied target distances. However, every elevation correction should be based on confirmed data. A properly prepared range card can therefore be carried, and final adjustments can be made for actual wind and atmospheric conditions.

Practical Training with an Economical PCP Platform

The rifle can also be used as a lower-cost training platform for shooters who participate in precision disciplines. Its familiar rifle-like profile, adjustable ergonomics and optic compatibility allow many fundamental skills to be practiced without the expense, noise and recoil associated with powder-burning ammunition.

Trigger control, breathing, natural point of aim and positional stability can all be refined. Additionally, timed stage routines can be rehearsed with approved targets on a controlled range. Magazine changes, supported positions and optic adjustments may be practiced while every safety rule remains in effect.

Because recoil is limited, technique errors can be identified more easily. If the reticle moves as the trigger is pressed, the shooter can examine grip pressure, body position or follow-through. Consequently, useful feedback can be obtained from every shot.

Training should still be approached with the same seriousness applied to any firearm or air weapon. The rifle must remain pointed in a safe direction, the trigger should not be touched until a shot is intended, and the shooting area must be protected by a reliable backstop.

Lawful Farm and Property Pest Management

Where local law permits, an appropriately powered and correctly configured rifle may be considered for professional pest-management work. Farms, barns and rural properties can present situations in which controlled airgun use may be more suitable than louder alternatives. However, legal authority, landowner permission and a safe shooting environment must always be confirmed first.

The target species must be legally permitted, and the selected calibre and energy level must be appropriate for humane control. The shooter must also be able to place the projectile accurately under realistic conditions. If a safe and ethical shot cannot be guaranteed, it should not be taken.

Before work begins, the area should be surveyed for buildings, roads, livestock, people and hard surfaces that could create a ricochet risk. A secure backstop must be identified for every possible shot direction. Distances should be measured rather than estimated, and the rifle’s zero should be confirmed with the same projectile that will be used.

For discreet movement around a large property, the Classic configuration may be appreciated for its slim sporter profile. A Tactical setup may instead be selected when mounting flexibility is required. Regardless of the configuration, the rifle must be carried safely and securely whenever it is not being used.

Responsible Small-Game Hunting

In jurisdictions where air-rifle hunting is legal, the platform may be configured for approved small-game species. A .22, .25 or .30 calibre version may be considered depending on quarry, permitted energy and expected distance. Nevertheless, calibre alone does not determine suitability. Projectile performance, accuracy, environmental conditions and the shooter’s ability must all be evaluated.

Before hunting is attempted, consistent groups should be demonstrated on paper targets from the exact positions likely to be used in the field. Personal range limits should be established honestly. A shot beyond the distance at which reliable accuracy can be maintained should always be declined.

The rifle should also be tested with the intended projectile to confirm feeding, stability and point of impact. If a sound moderator is being considered, it must be compatible with the rifle and legal in the relevant location. Any change to the muzzle arrangement should be followed by another zero check.

Ethical hunting depends on preparation, restraint and respect for wildlife. Therefore, applicable seasons, licenses, land permissions and species regulations should be verified before the rifle is transported into the field.

Extended Outdoor Shooting Sessions

An outdoor shooting day may involve changing distances, wind conditions and shooting positions. Under these circumstances, equipment organization becomes especially important. A hard case or padded rifle bag can be used for transportation, while magazines, approved filling equipment and basic maintenance supplies can be kept together.

Before leaving home, the rifle’s air pressure, fasteners and optic mounts should be checked. Spare magazines may be loaded only when safe and legal to do so, and the correct filling probe should be carried. Furthermore, a reliable pressure source should be available if the expected number of shots exceeds the capacity of one fill.

Environmental changes should also be considered. Strong wind can influence lighter projectiles, while rain and dust may affect exposed components. After use, moisture should be removed with a soft cloth, and the rifle should be stored in a dry location. Excessive lubricant should never be introduced into the high-pressure system.

Choosing the Right Configuration for Each Scenario

The Classic model can be selected when traditional handling, a streamlined appearance and comfortable field carry are prioritized. Synthetic, walnut and adjustable laminate options may be available, allowing durability, appearance or stock adjustment to be emphasized.

By comparison, the Tactical configuration is better suited to shooters who want extensive accessory compatibility. M-LOK mounting points, Picatinny interfaces and adaptable stock arrangements allow the external setup to be personalized. Only compatible accessories should be installed, and unnecessary weight should be avoided so that the rifle’s balance is preserved.

The Pro is most appropriate when match-style adjustment and positional stability are required. Its chassis and competition-oriented features support a precise fit, while the upgraded internal system provides the consistency demanded during structured shooting stages. Current configuration details can be checked through the official FX DRS MKII range.

Ultimately, the most practical setup will be determined by the intended use, local power restrictions and the shooter’s preferred handling characteristics. A sub-12 ft-lb .177 Classic may be ideal for economical target practice, whereas a full-power Tactical or Pro in a larger calibre may be better suited to legally authorized precision or field applications.

Whatever configuration is selected, reliable performance will be supported most effectively when safe handling, suitable projectiles, correct filling procedures and regular maintenance are combined. Through thoughtful setup and responsible use, the FX DRS MKII System can serve as a refined platform for recreation, training, competition and other lawful shooting activities.