Description

The FX Impact M4 Extended in .25 caliber is engineered for shooters who require the ultimate “slug thrower.” The 800mm barrel is the longest in the FX catalog, providing the maximum possible volume for air expansion to push heavy .25 projectiles to extreme distances with flat trajectories.

The M4 generation introduces a thicker, stronger top plate with an integrated dovetail rail, allowing the 30 MOA Picatinny scope rail to be positioned with absolute rigidity—eliminating point-of-impact shifts. The new Quick Set Trigger (QST) is a game-changer, allowing you to switch from a robust hunting trigger to a sub-ounce match trigger with a single screw. The internal Power Plenum 750 provides 75cc of regulated air, which, combined with the new high-flow brass piston regulator, ensures rapid refresh rates for consistent high-power strings.

Caliber .25 / 6.35 mm
Barrel Length 800 mm (Extended / Super Sniper)
Liner Type Superior Heavy STX (Slug Optimized)
Plenum Volume 75 cc (Power Plenum 750)
Regulator AMP MKII Brass Piston (Single Stage)
Max Energy Up to 135 Joules (approx. 100 ft-lbs)
Magazine Capacity 25 Rounds (New POM High-Cap design)
Air Capacity 580 cc Carbon Fiber Bottle
Overall Length 1120 mm (44″)
Weight 3.35 kg (7.35 lbs)