Specna Arms SA-C21 CORE Gen.2 HAL ETU M4 AEG – Black

The Specna Arms SA-C21 CORE Gen.2 HAL ETU is a no-nonsense M4 platform rifle engineered for skirmish play and target shooting. Balancing affordability with build quality, it combines CNC-machined components with reliable gearbox internals to deliver consistent performance across a wide operational envelope.

Key Features

• HAL ETU (Electronic Trigger Unit) – programmable firing modes (safe, semi, full auto, and custom profiles) for tactical flexibility.
• CNC Aluminium handguard and flash hider – precision-engineered for durability and aesthetics.
• M-LOK and 20mm Picatinny rail system – pre-installed sections support optics, lights, and foregrips without rail clutter.
• V2 Gearbox with standard motor – proven, user-serviceable architecture; field-strippable for maintenance.
• Multi-position M4 Crane stock – adjustable for ergonomics and battery storage.
• Rotary hop-up – precision adjustment for consistent grouping and range.
• 125-round mid-capacity magazine – realistic reload discipline; compatible with standard AEG medium-cap mags.

Real-World Use Cases

This rifle excels in woodland and urban CQB skirmishes where reliability and ease of upgrades matter. The programmable ETU appeals to players running organised milsim events (e.g. two-round bursts for realism), while the lightweight, modular design suits smaller frames and room-cleaners. The 310 FPS (on 0.20g) keeps it suitable for most UK sites without needing heavy chronographing; pair it with 0.25g or heavier BBs indoors for tighter grouping.

Technical Specifications

• Muzzle Velocity: 310 FPS (0.20g)
• Gearbox: V2 (cyclic rate ~10–12 RPS with standard motor)
• Hop-up: Rotary, user-adjustable
• Magazine Capacity: 125 rounds (mid-capacity)
• Battery: 7.4V LiPo (Deans connector)
• Firing Modes: Safe, semi-automatic, full automatic, programmable profiles
• Overall Length: 630 mm (with stock extended)
• Weight: 1.97 kg (unloaded)
• Rail System: 20mm Picatinny with M-LOK slots; pre-installed rail sections included
• Stock: Multi-position M4 Crane stock, sliding adjustment
• Construction: CNC aluminium handguard and flash hider; alloy outer barrel and trim; high-density polymer receiver, stock, and pistol grip; steel pins, screws, and dust cover
• Colour: Black
• Power: 7.4V LiPo (Deans connector)

Compatibility & Upgrades

The V2 gearbox is one of the most versatile platforms in airsoft; replacement springs, motors, and shimming parts are widely available. The 20mm Picatinny top rail accepts any RIS/RAS-compatible optic, and M-LOK slots allow modular handguard accessories (grips, lights, pressure pads). Mid-capacity magazine wells are standard across the industry, so reload options are plentiful. Users often upgrade to a warmer spring for outdoor play (11–12 FPS increase) or install a stronger motor for increased ROF without sacrificing reliability.

UK Legal & Site Notes

The SA-C21 CORE is a two-tone black replica (as standard) and complies with UK airsoft site safety rules. Most sites operate a 400 FPS floor for full-auto rifles; at 310 FPS this rifle is well within limits. Always chronograph with 0.20g BBs before play and carry proof of age (UKARA registration or defence exemption) if purchasing. Check your local site’s FPS caps and magazine rules – some venues restrict mid-caps in favour of realism.

Ready to upgrade your loadout? The SA-C21 CORE Gen.2 offers proven performance, modularity, and value for skirmishers stepping up from entry-level platforms or looking for a reliable second primary. Order today and enjoy fast, secure UK delivery.