Description

The FX Impact M4 Extended represents the ultimate evolution of the Impact platform. The standout upgrade is the rigid top plate, which is significantly thicker than the M3, providing a rock-solid mounting surface for the adjustable 30 MOA dovetail-to-Picatinny rail. This ensures that even with heavy 800mm barrels and large optics, there is zero flex in the system.

Internally, the M4 moves to a simplified but more robust single AMP MKII Brass Piston Regulator, designed to handle bottle pressures with a faster refresh rate and higher consistency than the dual-regulator M3. The Power Plenum 750 provides 75cc of regulated air, which, when combined with the 800mm barrel, allows for the highest possible muzzle energy in .22 caliber—ideal for stabilizing heavy slugs at distances exceeding 100 yards. The new UG1 AR15-style grip and Quick Set Trigger (switchable from hunter to match grade with one screw) round out the ergonomic package.

Caliber .22 / 5.5 mm
Barrel Length 800 mm (Extended / Super Sniper)
Barrel Type Superior Heavy STX (Slug Optimized)
Plenum Volume 75 cc (Power Plenum 750)
Air Capacity 580 cc Carbon Fiber Bottle
Max Fill Pressure 250 bar (3625 psi)
Regulator AMP MKII Brass Piston (Single Stage)
Energy Up to 117 Joules (approx. 87 ft-lbs)
Magazine 28 Rounds (Redesigned for durability)
Overall Length 1120 mm (44″)