FX Impact M4 600mm Compact Air Rifle

Big Power, Tiny Package — Just 25" Long | Power Plenum 750 | Quick Tune System | Interchangeable Calibers & Liners

Swedish engineering, distilled. FX Airguns blends serious power and legendary accuracy into a remarkably small package with the new Impact M4 Compact. Featuring a 500mm barrel and an overall length of just 25", the Compact only comes up short in one area—and that's the length! A stubby 300cc removable carbon fiber bottle is the only other departure from the standard Impact, yet it still delivers a solid shot count despite its compact size.

Standard Impact power, Compact size. Long-time fans may recall that early standard-size Impacts produced these same specs—with a longer barrel and larger cylinder. The Compact achieves it all thanks to the new Power Plenum 750.

Why Choose the Impact M4 Compact?

• ✅ Ultra-Compact 25" Length — Full Impact power in a tiny footprint
• ✅ Power Plenum 750 — +75cc firing chamber & new valving for a wider power range
• ✅ Redesigned Power Block — Better airflow, efficiency & slug performance
• ✅ FX Quick Tune System — Nearly tool-free tuning
• ✅ AMP MKII Regulator — Externally adjustable match precision
• ✅ Smooth Twist X (STX) Barrel — Astonishingly accurate, swappable liners & calibers
• ✅ Dual Transfer Ports (.22/.25) — One for pellets, one for slugs
• ✅ Reversible Forward Side-Lever — Smooth, ambidextrous cocking
• ✅ Twin Wika Gauges — Cylinder + regulator pressure
• ✅ Convert to Full-Size Impact — Endless platform possibilities
• ✅ Lightweight 6.1 lbs
• ✅ 3-Year Transferable Warranty

Description

Swedish manufacturer FX Airguns continues to turn out innovative new models—blending power and accuracy into a very small package with the new Impact M4 Compact! Featuring a 500mm barrel and an overall length of just 25", the Compact only comes up short in one area, and that's the length! A stubby 300cc removable carbon fiber bottle is the only other departure from the standard Impact, and still provides a solid shot count despite the small size.

Impressive Power & Shot Counts

From a 250 BAR fill, expect up to:

FX achieves this impressive stat line thanks to the Power Plenum 750! Adding 75cc of firing chamber volume and new valving allows for numbers that simply couldn't be achieved before this innovation.

The Redesigned Power Block

This performance is also due, in part, to the rear Power Block. While the power plenum stages the power capabilities, the rear block handles power transfer much like a car's carburetor. FX redesigned the rear block and valve housing for better airflow, efficiency, and power potential. The Power Block is especially useful for those shooting heavy slugs—and slug shooters are encouraged to add the FX Impact Tungsten Hammer Weight to allow for higher working pressures.

All the Innovation You Expect

The rest of the rifle packs all the innovation the Impact is known for: the AMP MKII regulator, external hammer spring adjustment, and valve control—together known as the new Quick Tune System, unlike anything else on the market! The Compact still uses the Smooth Twist X (STX) Superior barrel liner system, proven astonishingly accurate, so you can easily change calibers and liners—and even turn your Impact Compact into a standard-size Impact if you desire. The possibilities are truly endless!

Specifications

Key Features in Detail

• Full Power, Compact Frame — A 25" overall length and 300cc bottle that still hits standard-Impact numbers thanks to the Power Plenum 750.
• Wider Power Range — 75cc of added firing-chamber volume plus new valving unlock energy levels previously impossible.
• Slug-Ready Power Block — A redesigned rear block and valve housing for superior airflow, efficiency, and heavy-slug performance (add the Tungsten Hammer Weight for higher pressures).
• Tune in Seconds — The Quick Tune System pairs the AMP MKII regulator with external macro/micro hammer-spring and valve-control adjustment—nearly tool-free.
• Astonishing Accuracy — The Smooth Twist X Superior barrel liner system, with swappable calibers and liners.
• Built to Customize — Dual transfer ports (.22/.25), 30 MOA optics rail on 11mm dovetail, multiple Picatinny accessory rails—and the option to convert to a full-size Impact.
• Shooter Comfort — FX UG1 AR15-style grip, AR15-style manual safety, height-adjustable rubber buttpad, all at just 6.1 lbs.