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SA M4 Keymod Gen2 (SA-F02 FLEX™ HAL ETU™) – Black
Specna Arms M4 Keymod Gen2 (SA-F02 FLEX™ HAL ETU™) in black finish is a high-performance airsoft rifle with 115 m/s power and upgraded internals. It features a HAL ETU™ processor unit with pre-cocking and trigger sensitivity adjustment. The nylon body and Keymod handguard ensure excellent handling, while the TDC hop-up chamber with Helium™ flat bucking delivers great accuracy.
For more than 25 years, we know what you like about airsoft.
Accessories
10,57 € In StockWST Ms2 MULTI-FUNCTION SLING, 2-Point - Black: WoSporT
MAG022
Ms2 MULTI-FUNCTION SLING tactical sling from WoSporT in black. For airsoft and real firearms, including duty use. 2-point sling with the option to switch to 1-point. MS2 sling replica in Magpul style. Heavy-duty steel carabiners with quick release and safety lock.
10,57 €Out of stock
9,26 € In StockBLS PRECISION Airsoft Pellets 0.25g, 4000 BBs (Bag) - White: BLS
1KG-H25
BLS PRECISION Airsoft Pellets weighing 0.25 g in a pure white finish. 1 kg package (resealable bag, 4000 BBs). The most popular ammunition for all airsoft guns (rifles, sniper rifles, LMGs, SMGs, shotguns, and pistols). Suitable for AEG, HPA, gas guns, and spring-powered replicas. The world’s best-selling BBs. Hand-measured quality control. BLS –...
9,26 €In Stock
9,68 € In StockBLS PRECISION Airsoft Pellets 0.28g, 3500 BBs (Bag) - White: BLS
1KG-H28
BLS PRECISION Airsoft Pellets weighing 0.28 g in a pure white finish. 1 kg package (resealable bag, 3500 BBs). The most popular ammunition for all airsoft guns (rifles, sniper rifles, LMGs, SMGs, shotguns, and pistols). Suitable for AEG, HPA, gas guns, and spring-powered replicas. The world’s best-selling BBs. Hand-measured quality control. BLS –...
9,68 €In Stock
10,57 € In StockFMA Short Vertical STUBBY Grip with QD RIS Rail Mount - Black: FMA
TB1261-BK
QD Tactical Stubby Grip by FMA in black finish. For quick and secure attachment to RIS handguards using a QD lock. Lightweight and durable construction made from polymer. Non-slip grooves for better grip. The grip is hollow and features a screw-on cap for storing small items.
10,57 €In Stock
9,73 € In StockSA Hi-Cap Magazine S-MAG for M4 / AR15, 380 BBs - TanSPARMS029-DE
S-MAG Hi-Cap Magazine for AEG M4 / AR15 Rifles (MK18, HK416) by Specna Arms in Dark Earth. 380 BBs capacity. Reliable winding, perfect feeding, less frequent reloading. Durable polymer body with texture for a secure grip. Slim profile suitable even for tight pouches. Best choice for Specna Arms PRIME™ rifles and other series.
9,73 €In Stock
9,30 € In StockSA Mid-Cap Magazine S-MAG for M4 / AR15, 125 BBs - BlackSPARMS030-BK
S-MAG Mid-Cap Magazine for AEG M4 / AR15 Rifles (MK18, HK416) by Specna Arms in black. 125 BBs capacity. Reliable feeding even at high RoF and with heavier BBs. Durable and lightweight polymer body with textured surface for a secure grip. Slim profile suitable even for tight pouches. Best choice for Specna Arms PRIME™ rifles and other series.
9,30 €In Stock
93,04 € In StockFMA AN/PEQ15 LA5-C UHP Version (LED Flashlight, Green / IR...: FMA
TB1075-BK
AN/PEQ15 LA5-C Ultra High Power airsoft version by FMA in black color. LED flashlight with functional IR covers. More powerful green and IR laser for use with NVG. Compact size and durable nylon body. Mounts on RIS rail for weapons like M4, MK18, AK, CZ EVO, and others. PEQ box adds tactical versatility without adding weight. Powered by 2 CR123A...
93,04 €Out of stock
16,92 € In StockWST LEVER SILENCE Speedloader, 1000 BBs – Black: WoSporT
WOSP77-BK
WoSporT LEVER SILENCE speedloader with a 1000 BB capacity in black is a high-capacity speed loader designed for quickly loading M4 / AR15 mid-cap magazines using a crank mechanism inspired by the PTS M12. The SILENCE version features an internal silicone insert that reduces BB rattling. Optional adapters are available for AK, MP5, and G36 magazines.
16,92 €Out of stock
12,69 € In StockWST FARAON 2-Point Tactical Sling – Black: WoSporT
WOSP166-BK
WoSporT quick-adjust 2-point sling FARAON in black finish is a universal weapon sling designed for fast handling. It allows an instant transition from secured carry to shooting position and features a rubberized pull tab for a firm grip. The design is based on proven Ferro Slingster-type slings with additional improvements for comfortable use.
12,69 €Out of stock
63,01 € In StockVO MAVERICK 1x22 Gen3 Red Dot Sight, S-MIL - BlackSCRD-41
MAVERICK 1x22 Gen3 Red Dot Sight by Vector Optics in black (S-MIL). The best-selling airsoft red dot sight. 3 MOA dot for fast aiming. 11 brightness levels of red illumination. Side-loading battery tray for replacement without losing zero. Rubber-armored body for scratch resistance. Optical center height 41 mm. Includes a killflash to prevent lens...
63,01 €In Stock
28,33 € In StockTITAN Li-Pol Battery 11.1V / 1000mAh, 25C (T-Dean) – Buffer...: TITAN
TIT027
TITAN 11.1V / 1000mAh 25C Li-Pol Battery in the Buffer Stick configuration with a T-Dean connector is a high-performance 3S LiPo battery designed for AEG airsoft guns. It delivers a higher rate of fire, faster trigger response, and consistent performance in all weather conditions. It is perfect for players who want to get the max rifle performance....
28,33 €On the way
168,74 € In StockSA EDGE™ Maverick-IV Red Dot Sight and 3x Magnifier Kit - BlackSPARMS274-BK
Specna Arms EDGE™ set of Maverick-IV red dot sight and 3x magnifier in black. Accuracy and reliability in a value package. Quick attachment with QD mount on a RIS rail. Excellent combo offering the option for close-range (CQB) and medium-range shooting with a 3x flip-to-side magnifier. Suitable for AEG, GBB, and HPA guns. Magnifier is also suitable...
168,74 €Out of stock
105,30 € In StockVictoptics C1 4x32 Prism Scope - BlackOPSL40
C1 4x32 Prism Scope by VictOptics in black. Lightweight and compact optic with 4x magnification. BDC reticle for .223 / 5.56 caliber, 750 G shockproof. Rubber-armored body for increased protection. Top plate for mounting red dot (TEK / MOJ / MGT footprint). Red and green illumination (5 levels each). IPX4 water resistance. Nitrogen purged to...
105,30 €Out of stock
52,86 € In StockGens ACE Charger G-TECH iMars Mini 2-4S, 60W (USB-C) + AC...: Gens ACE
GEA60WE1
G-TECH iMars Mini Charger by Gens ACE in black. Set includes power adapter and USB-C cable. Up to 60 W charging power. Supports smart G-TECH batteries. Designed for Li-Pol / LiFe (2–4S) / LiHV / NiMH (2–12S). Suitable for FPV drones, airsoft, and RC models. Powered via USB-C (PD, QC, etc.). XT60 and T-Dean adapters included.
52,86 €In Stock
21,15 € In StockGens ACE Li-Pol Battery 11.1V 1000mAh, 25C, T-Dean - Buffer Stick: Gens ACE
GEA10003S25D
LiPo Battery 11.1V - 1000 mAh (25C) by Gens ACE in Buffer stick configuration. Dimensions of 103 x 18 x 16 mm. T-Dean connector. High-performance 11.1V LiPo battery with 25C discharge rate. Increases rate of fire and improves motor response. Suitable for AEG rifles, machine guns, SMG/PDW, and DMR platforms. Use only with quality high-performance...
21,15 €In Stock
41,87 € In StockTITAN Li-Pol / Li-Ion DIGITAL CHARGER V2 (EU) – Black: TITAN
TIT032
TITAN DIGITAL CHARGER V2 (25 W / EU) is a compact charger for Li-Pol and Li-Ion batteries featuring USB-C power input and a digital display. It supports 2S and 3S batteries (7.4V–11.1V), provides fast charging, and also works as a battery tester in the field.
41,87 €In Stock
84,16 € In StockSA URBAN WAR Transport Rifle Bag (87×30×8 cm) – BlackSPARMS398-BK
Specna Arms transport bag URBAN WAR in black finish is a durable bag for safe transport of firearms and airsoft rifles up to 87 cm. It offers space for 2 long guns, practical accessory pockets and backpack carry option. Made from Cordura 1000D and durable nylon with padding to protect your gear during transport. The bag features MOLLE webbing and a VELCRO...
84,16 €In Stock
Why Choose M4 Keymod FLEX™ Gen2 from Specna Arms?
Specna Arms M4 Keymod Gen2 (SA-F02 FLEX™ HAL ETU™) is built on a lightweight yet durable FLEX™ series nylon body reinforced with glass fiber, offering a realistic matte finish and high durability, outperforming cheaper alloy bodies. The outer barrel with a 14 mm CCW thread and steel components such as pins, screws, and the ejection port provide strength where needed. The result is a lightweight yet robust assault rifle platform ideal for CQB environments and dynamic gameplay. The AR15 (M4) platform offers intuitive controls, including an ambidextrous charging handle, clear fire selector, and easy hop-up adjustment via the ejection port. The Keymod handguard allows mounting accessories such as a foregrip, tactical flashlight, or PEQ box. The spacious Crane Stock with QD sling points ensures a stable shooting platform. The battery is stored in the stock, allowing the use of buffer stick, nunchuk, or crane batteries. Overall, this rifle combines low weight, modern construction, and high-quality Gen2 internals. The FLEX™ Gen2 series includes features such as the Æther™ gearbox with HAL ETU™, metal nozzle, TDC hop-up chamber with Helium™ flat bucking, and a 6.03 mm precision inner barrel.
Key Features of Specna Arms M4 Keymod FLEX™ Gen2
Technical Specifications
- Platform: M4 / AR-15
- Series: FLEX™ Gen2
- Length: 790-875 mm
- Weight: 2340 g
- Power Source: AEG
- Unit: HAL ETU™
- Gearbox: Æther™ V2 QSC
- Quick Spring Change: Yes (ESA™)
- Hop-up: TDC
- Inner Barrel: 6.03 mm
- Velocity: 115 m/s
- Bearings: 8 mm
- Connector: T-Dean
- Body Material: Fiber-reinforced nylon
- Handguard: Keymod
- Thread: 14 mm CCW
Package Contents
- Specna Arms M4 Keymod FLEX™ Gen2
- Hi-cap magazine (300 BBs)
- Flip-up sights
- M90 spring
- Specna Arms stickers
- User manual
Important Setup Instructions
To use the rifle, you must activate the HAL ETU unit by following these steps, otherwise the gun will not respond:
- Set the fire selector to Safe
- Connect the battery and wait 3 seconds until you hear a beep
- Pull and hold the trigger for 5 seconds until another beep is heard
- The rifle is now ready to use
| Variants | FLEX™ Gen2 |
| Color | Black |
| Muzzle velocity (m/s) | 115 (m/s) |
| Recommended weight of ammunition | 0,25g - 0,28g |
| Thread (mm) | 14- (mm) |
| Outer length MINIMAL (mm) | 795 (mm) |
| Outer length MAXIMAL (mm) | 875 (mm) |
| Inner barrel length (mm) | 365 (mm) |
| Weight (g) | 2345 (g) |
| Body/receiver material | ABS / Plastic |
| Mounting System | KeyMod |
| Gearbox version | V2 - ESA™ |
| Amount of piston teeth | 14 |
| Bearings (mm) | 8 (mm) |
| Bearings (material) | Metal |
| Piston head | Plastic |
| Nozzle | Metal |
| Spring guide | Plastic |
| Hop-Up chamber material | Plastic |
| Battery type | Buffer stick |
| Connector type | T-Dean |
| Magazine material | Plastic |
| High-cap / Mid-cap | High-cap |
| Magazine capacity | 300 |
| Processor unit | YES |
| Blowback | NO |
| Battery included | NO |
| Battery Charger | NO |
| Weapon accessories | Yes |