FX Impact M4 .22 Extended

FX Impact M4 — Extended — .22 Caliber PCP Air Rifle

The most iconic name in airguns, pushed to its furthest reach.

The FX Impact M4 Extended in .22 caliber is the longest-barreled configuration of FX's flagship Impact platform — the rifle that changed the airgun industry when it first launched in 2015, now in its most refined and rigid form yet. With an 800mm barrel and the largest air capacity in the M4 lineup, the Extended is built for shooters who want maximum shot count and peak velocity consistency in one package, whether on the bench, in the field, or on the competition line.

Key Specs (.22 Cal, Extended Configuration)

• Caliber: .22 (5.5mm)
• Barrel length: 800mm / 31.5"
• Barrel liner: Superior Heavy STX
• Overall length: 1120mm / 44"
• Weight: 3.35 kg / 7.35 lbs
• Max energy: Up to 87 FPE (using FX Slug Power Kit)
• Shot capacity: Up to 330 shots per fill (.22)
• Magazine capacity: 28 rounds (Side Shot magazine)
• Action: Reversible side-lever, repeater — bolt and magazine both switchable for left-hand shooters
• Power plant: Pre-charged pneumatic (PCP)
• Max fill pressure: 250 BAR (factory carbon fiber bottle rating)
• Trigger: Redesigned Quick Set Trigger (QST), fully adjustable
• Regulator: AMP MKII, externally adjustable
• Transfer port: Dual transfer port system, tunable for pellets or slugs
• Tuning system: FX Quick Tune — adjust power with minimal tools
• Top rail: Reinforced thick top plate, 11mm dovetail with longer adjustable Picatinny scope rail for custom eye relief
• Power Block: Rear-mounted FX Power Block for maximum power potential
• Pressure monitoring: Dual WIKA gauges (air cylinder + regulator pressure)
• Warranty: 3-year transferable

Why Shooters Choose the Impact M4 Extended

• The benchmark platform, maximized. The Impact name carries a decade-plus reputation for accuracy and innovation — the Extended config pushes that platform's barrel length and air capacity to their practical limit.
• Shots for days. Up to 330 shots per fill in .22 means fewer trips back to the compressor and more time shooting.
• Pellets or slugs, dialed in. The dual transfer port and Quick Tune system let you optimize the same rifle for either projectile type without major surgery.
• True ambidextrous capability. Both the bolt and magazine can be moved to the left side, giving left-handed shooters the same ergonomics as right-handed ones.
• Built to compete. A thicker, more rigid top plate and adjustable scope rail positioning mean your optic stays put and your eye relief stays exactly where you set it.
• Backed properly. FX's 3-year transferable warranty reflects genuine confidence in the build.

What's in the Box

• FX Impact M4 Extended rifle (.22 cal, 800mm barrel)
• One Side Shot magazine
• Owner's manual