When it launched, the FX Impact redefined what a PCP (Pre-Charged Pneumatic) rifle could be. Now, with the arrival of the FX Impact M4, the Swedish manufacturer has taken their flagship platform to its most refined and powerful state yet. In the heavy-hitting .35 caliber, this rifle ceases to be just a target shooter and becomes a legitimate powerhouse for big-game hunting and long-range precision.
What’s New: The M4 Evolution
The M4 isn’t just a facelift; it’s a structural and mechanical overhaul based on years of feedback from the world’s top competitive shooters and hunters.
1. The Quick Set Trigger (QST)
The most significant upgrade is the new trigger system. Historically, users had to choose between a hunting trigger or a match-grade one. The M4 introduces the Quick Set Trigger, which allows you to switch between a crisp, lightweight match pull and a more robust hunting weight with a simple adjustment—no extra parts required.
2. Enhanced Rigidity and Optics Mounting
Precision at long distances requires a rock-solid platform. The M4 features a new, thicker top plate that significantly increases the overall rigidity of the rifle. Additionally, the optics rail is now a 30 MOA Picatinny rail mounted on a dovetail track, allowing you to slide the entire rail forward or backward to achieve the perfect eye relief for any scope or night vision unit.
3. Simplified, High-Performance Regulator
While the M3 used a dual-regulator system, the M4 moves to a single, high-performance Brass Piston AMP MKII Regulator. This new design is stronger and more consistent, capable of handling higher bottle pressures (up to 250 bar) while offering faster refresh rates—crucial for the high air demands of the .35 caliber.
Power Meets Precision in .35 Caliber
The .35 caliber (9mm) version is the “heavyweight” of the family. Combined with the 800mm Superior Heavy STX barrel, this rifle is built to push heavy slugs with devastating energy.
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Energy: Capable of generating over 150 ft-lbs (200+ Joules) of muzzle energy, making it suitable for ethical hunting of medium to large game.
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Capacity: Despite being a large caliber, the high-capacity Side Shot magazine holds 18 rounds, giving you plenty of follow-up shots in the field.
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Autonomy: With the 580cc carbon fiber tank and the efficiency of the Power Plenum 750, you can expect approximately 45 consistent shots per fill.
Technical Specifications
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Caliber: .35 (9mm)
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Barrel Length: 800mm (Extended/Sniper versions)
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Air Capacity: 580cc Carbon Fiber Bottle
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Plenum Volume: 75cc (Power Plenum 750)
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Cocking System: Ambidextrous, reversible side-lever with a new “gravity-stay” feature (it won’t slam shut if the rifle is tilted).
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Grip: New FX UG1 AR-style grip with enhanced ergonomics and beaver tail.
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Weight: Approx. 7.35 lbs (3.35 kg).
Final Verdict
The FX Impact M4 .35 is arguably the most versatile large-caliber air rifle on the market. It manages to balance extreme adjustability (hammer spring, valve flow, and regulator) with a new level of “out-of-the-box” reliability.
For the serious enthusiast who wants a rifle that can win a Benchrest competition on Saturday and go hog hunting on Sunday, the M4 .35 caliber is the ultimate tool. It is an investment in the cutting edge of airgun technology.
Core Specifications & Shared Features
Regardless of the barrel length, all FX Impact M4 models in .35 caliber share these high-end engineering features:
| Feature | Specification / Description |
| Caliber | .35 (9mm) |
| Regulator | Externally adjustable AMP MkII (Adjustable Match Precision) |
| Plenum | 75cc Power Plenum 750 |
| Max Fill Pressure | 250 bar (3,625 psi) |
| Magazine Capacity | 18 Rounds (Side Shot High Capacity) |
| Trigger | Quick Set Adjustable Trigger (Match to Hunt settings) |
| Optics Rail | Picatinny with 30 MOA compensation |
| Adjustment System | Quick Tune System (Macro/Micro hammer & Valve control) |
| Grip & Safety | UG1 AR-style pistol grip / AR15-style manual safety |
| Warranty | 3-Year Transferable |
Configuration Comparison: Standard, Sniper, and Extended
The main differences lie in the barrel length, overall footprint, and air capacity. Choose the model that best fits your needs, whether it’s maneuverability or long-range power.
| Model | Barrel Length | Overall Length | Weight | Air Cylinder | Barrel Liner Type |
| Standard | 600mm (23.6″) | 34″ | 6.85 lbs | 480cc Carbon Fiber | STX Superior |
| Sniper | 700mm (27.5″) | 39″ | 7.15 lbs | 580cc Carbon Fiber | STX Superior |
| Extended | 800mm (31.5″) | 44″ | 7.35 lbs | 580cc Carbon Fiber | STX Superior Heavy |
Pro Tip for the Extended Model: The 800mm version is specifically optimized for heavy slugs and provides approximately 45 shots per fill when paired with the FX Slug Power Kit.
