Specna Arms SA-F11 FLEX M4 CQBR – X-ASR MOSFET Black

The Specna Arms SA-F11 FLEX M4 CQBR is purpose-built for close-quarters engagements, indoor sites, and rapid CQB gameplay. This compact 70mm rifle combines Specna Arms’ proven AEG platform with modern ergonomics and field-tested reliability, making it an ideal choice for skirmishers seeking a short, responsive gun without sacrificing power or accuracy.

Key Features

• X-ASR MOSFET – electronic trigger control with improved responsiveness and durability
• Rotary hop-up – precise, adjustable backspin for consistent grouping at CQB ranges
• Compact 70mm profile – ideal for indoor sites, vehicle CQB, and tight environments
• Multi-position M4 crane stock – length-of-pull adjustment for comfort and control
• 20mm Picatinny receiver rail – universal optic and accessory mounting
• 380-round high-capacity magazine – reduced reload cycles during extended play
• Alloy and polymer hybrid construction – balance of durability and weight management

Real-World Use Cases

CQB skirmishers will appreciate the SA-F11 FLEX’s manoeuvrable size and quick-handling characteristics in tight corridors and close-range firefights. Milsim players benefit from the authentic AR-15 platform profile and full Picatinny customisation for loadout building. Indoor site regulars will value the 305 fps energy, which sits comfortably below the typical 350 fps indoor limit, reducing site chronographing concerns. The rotary hop-up ensures reliable accuracy even in smaller 70mm barrel length, critical when every shot counts in close quarters.

Technical Specifications

• Chrono: 305 fps (0.20g BBs)
• Gearbox: V2 platform
• Motor: Standard (long-pinion compatible)
• Hop-up: Rotary, adjustable
• Magazine Compatibility: AEG high-capacity, wheel-wound
• Battery: 7.4V Deans connector (included)
• Rail System: 20mm Picatinny receiver rail
• Stock: Multi-position M4 crane stock, sliding
• Length: 70mm (compact CQB length)
• Weight: 2.3 kg (unloaded, magazine empty)
• Firing Modes: Safe, semi-automatic, full automatic
• Colour: Black

Compatibility & Upgrades

The SA-F11 FLEX uses the ubiquitous V2 gearbox, meaning thousands of aftermarket upgrade parts are available: high-torque motors, reinforced gears, upgraded air-seal nozzles, and tuning springs. The rotary hop-up accepts standard AEG rubber bucking and nub combinations, allowing fine-tuning for different BB weights and ranges. The Deans connector supports any 7.4V LiPo battery; users may opt for higher-voltage 11.1V LiPos for increased rate of fire and trigger response (though motor strain and trigger assembly wear may increase). The 20mm receiver rail accommodates any Picatinny-compatible sight, laser, or foregrip, enabling rapid customisation for specific roles or loadouts.

UK Legal & Site Notes

The Specna Arms SA-F11 FLEX is a two-tone black AEG airsoft rifle and is legal to own and operate in the UK under VCRA (Violent Crime Reduction Act) guidelines without requiring a defence or license, provided it is used responsibly on a registered airsoft site or private land with permission. All UK airsoft skirmish venues recognise AEG rifles; chrono requirements vary by site (typically 350 fps for CQB, 450 fps for outdoor). The 305 fps energy output comfortably fits most indoor and hybrid site limits. Always carry the gun in a bag or protective case when travelling, and never display it in public.

Ready to join the action? The Specna Arms SA-F11 FLEX M4 CQBR is in stock now at Airsoftdirect UK. Order today and enjoy next-working-day delivery. Questions? Contact our airsoft experts for advice on batteries, magazine compatibility, or recommended upgrades.