FX Impact M4 Compact

FX Impact M4 Compact: The Bullpup Benchmark in a Portable Package

The FX Impact M4 Compact is a regulated PCP bullpup built by FX Airguns, and it represents the most portable configuration in the legendary Impact lineup. If you have searched for an FX Impact M4 Compact review, this rifle measures just 640mm and weighs 2.8kg unscoped, making it exceptionally manoeuvrable . Consequently, it suits hunters and pest controllers across Sweden, Finland, Estonia, and other EU countries where high-power PCP rifles are permitted. Moreover, the Compact variant shares the same 75cc Power Plenum and AMP MKIII regulator as its longer siblings . Because it features a 500mm Superior STX barrel, it delivers exceptional accuracy in confined spaces. Therefore, whether you are checking the FX Impact M4 price or comparing it against the FX Impact M4 Compact Bronze, this platform deserves serious consideration for shooters wanting flagship performance in a compact package.

FX Impact M4 Compact Specifications: Calibre, Power, and European Availability

The Impact M4 Compact comes in .177, .22, .25, and .30 calibres. The .22 version delivers up to 40 Joules in European configuration, with FAC versions reaching higher energies . Weight sits at 2.8kg unscoped and overall length measures just 640mm with a 500mm barrel . The 300cc carbon fibre bottle fills to a maximum of 250 bar, while the AMP MKIII regulator handles working pressures up to 170 bar . Shot count reaches approximately 35 shots per fill in .22 calibre at moderate settings. Magazine capacity runs 28 rounds in .22 and 25 in .25 . The barrel features a 1/2 inch UNF thread for moderator attachment. Therefore, shooters in Sweden, Finland, and Estonia should verify local energy limits before ordering.

AMP MKIII Regulator and Quick Set Trigger

The defining feature of the Impact M4 is its redesigned regulator system. The dual regulators of the M3 have given way to a single AMP MKIII regulator with a brass piston, delivering stronger, more consistent performance and higher refill flow . Moreover, the Quick Set Trigger allows instant adjustment between hunting and match configurations with a single screw . The 75cc Power Plenum delivers maximum air capacity and optimised airflow for heavy slugs . The Quick Tune System offers 16-step macro adjustment and micro-fine tuning for hammer spring tension. Consequently, you can tune the rifle for different pellet weights and power levels without disassembly.

FX Impact M4 Compact Problems Owners Report

Owners report several significant issues worth knowing. Accuracy disappointment appears frequently, with one owner stating “I am HUGELY DISAPPOINTED with this gun” and noting the valve adjuster can only max at 4 lines, not 5+ like longer versions . Moreover, moderator inconsistency has plagued some owners, with one noting “I almost returned my gun because it wasn’t consistent and I shot nearly 2000 pellets through it” until discovering the moderator was the cause . Barrel liner problems remain a constant source of irritation, with one dealer reporting a 90% return ratio on Impacts before ceasing to stock them . Magazine and probe alignment issues have caused jamming and double feeds . Therefore, owner feedback suggests testing the rifle thoroughly upon receipt and being prepared for significant tuning effort.

Accuracy, Pellet Choice, and Range Performance

Pellet choice significantly impacts the Impact M4 Compact’s accuracy. The 500mm Superior STX barrel performs best with JSB Exact pellets in the 18-grain range for .22 calibre . Moreover, the Compact excels at close to medium-range pest control, with one reviewer confirming it “excelled at everything from farmyard pest control to squirrel culling and sniping rabbits from the support of a bipod” . The regulated system delivers consistent velocities when properly tuned. Consequently, test multiple pellet weights to find what your individual barrel prefers. The Compact version works best at ranges up to 50 metres, where its shorter barrel maintains excellent accuracy without the added length of standard models.

FINAL VERDICT

The FX Impact M4 Compact represents exceptional value in a portable flagship PCP platform. It offers a 500mm barrel, 75cc Power Plenum, and AMP MKIII regulator at an accessible price point for its class. However, accuracy disappointment, moderator sensitivity, and barrel liner issues mean it suits shooters willing to invest significant time in tuning and testing rather than expecting turnkey perfection. Purchase from a reputable European retailer with warranty support and knowledge of local regulations. Consider adding a quality moderator tested for consistency, and a pellet sampler pack to find the best ammunition for your barrel. Therefore, verify your country’s energy limits before ordering, as regulations vary across EU member states including Sweden, Finland, and Estonia. Shop at Airgun Armoury.