SA-F04-RL FLEX™ BLDC™ Light Ops Stock HAL ETU™ Gen. 2 – Black (Specna Arms)

SA-F04-RL FLEX™ BLDC™ Light Ops Stock HAL ETU™ Gen. 2 – Black (Specna Arms) delivers a premium out-of-the-box experience for players seeking performance, durability and modularity. Redesigned Flex Gen.2 carbines combine a lightweight ergonomic chassis with reinforced internals to provide reliable accuracy and serviceability under heavy use.

Top-end internals—TDC Magnus™ hop-up (Top Down Center) with Helium™ Flat Hop Eraser, sealed aluminum nozzle and the reinforced Æther™ gearbox—ensure consistent BB trajectory and easy AoE/trigger tuning. The factory-installed Specna Arms Dark Matter™ High Speed 27k brushless motor gives smooth, efficient power and longevity. The ESA™ quick-change spring system allows rapid performance adjustment up to M140 springs without workshop tools.

The HAL™ system (Hall effect sensors) brings advanced control: magnetic trigger detection, active braking, binary trigger capability, adjustable trigger sensitivity (5 levels), adjustable pre-cock (6 levels), and programmable firing modes including AUTO (3-shot burst then full auto) and multiple semi/burst variants. Programming is intuitive via the trigger — perfect for players who want on-the-fly customization.

The replica mixes reinforced nylon polymer with metal components in high-stress areas (flash hider, outer barrel, bolt carrier parts, selector, QD sling mounts etc.) for structural strength with reduced weight. The Light Ops Stock is minimalist and comfortable with rubber anti-slip cheek pads and a contoured butt. Enlarged controls and a functional bolt catch improve handling under stress.

Internals include 8mm bearings, steel gears, a polycarbonate piston with full steel teeth, a precision 6.03 mm inner barrel (229 mm) and the high-speed BLDC motor. The package contains useful accessories (2× S-MAG mid-caps, speedloader, cleaning rod, Allen key, small Tamiya–Deans adapter, spare M90 spring). Battery and charger are not included. Note: on first power-up, hold the trigger in SAFE for ~5 seconds to initialize HAL™.

Features (EN):

• Manufacturer / series: Specna Arms – FLEX™ Gen.2
• Model: SA-F04-RL FLEX™ Light Ops Stock HAL ETU™ Gen. 2 (black)
• Build: nylon-fiber reinforced polymer + metal critical parts
• Motor: Specna Arms Dark Matter™ High Speed 27k (brushless BLDC)
• Gearbox: Æther™ reinforced (v2) – quick spring release, AoE windows, trigger adjustment
• Hop-up: TDC Magnus™ (Top Down Center) + Helium™ Flat Hop Eraser
• Inner barrel: 6.03 mm precision, 229 mm length (inner)
• Internals: 8mm bearings, steel gears, polycarbonate piston with steel teeth
• Spring system: ESA™ quick-change (ready for M140)
• Electronics: HAL™ ETU Gen.2 (Hall sensors, active brake, binary, programmable modes, low-battery alarm)
• Firing modes: full auto, semi, programmable bursts (3/5), binary etc.
• Magazine capacity: 125 rounds (S-MAG mid-cap)
• Included: 2× S-MAG mid-cap, cleaning rod, replica, Allen key, small Tamiya–Deans adapter, speedloader, spare M90 spring
• Battery included: no
• Connector: DEANS / T-connect (adapter included)
• Muzzle velocity: 390 FPS
• Overall length: 75 cm
• Weight: 2125 g
• Barrel thread: 14 mm CCW
• Color: black