SA M4 CQB RL M-LOK Gen2 (SA-F04-RL FLEX™ BLDC™ HAL ETU™) – Green

M4 CQB RL M-LOK Gen2 (SA-F04) airsoft rifle from the FLEX™ line by Specna Arms in green.

Gen2 features a reinforced AETHER™ gearbox packed with upgrade parts and a brushless motor like the PRIME™ series.

11.1V Li-Po battery and EASY LIPO CHARGER included.

Lightweight RL AR15 nylon receiver reinforced with fibers.

HAL ETU™ electronic trigger unit.

MAGNUS™ TDC hop-up chamber.

Technical Specifications

• Power: AEG
• Materials: Nylon, polymer, metal
• Length: 670–750 mm
• Weight: 2125 g
• Velocity: 115 m/s (1.4 J)
• Inner barrel length: 229 mm
• Inner barrel diameter: 6.03 mm
• Hop-up: Yes (TDC)
• Fire modes: Semi, Full Auto, Binary, Pre-Cocking and more
• Muzzle thread: 14-mm CCW
• Handguard: M-LOK
• Recommended battery: 11.1V Li-Po (included with charger)
• Connector: T-Dean
• Best battery type: Buffer stick
• Magazine capacity: 125 BBs (Mid-Cap)
• Motor type: Brushless

Package Contents

• Specna Arms M4 Flex Gen2 AEG
• 2× S-MAG 125 BB Mid-Cap magazines
• Specna Arms 11.1V 1000 mAh (20C) Li-Po battery
• Specna Arms EASY LiPo Charger
• Speedloader for mid-caps
• Flip-up sights
• Spare M90 spring
• HAL ETU™ programming card
• Specna Arms stickers
• User manual

Warnings

• Some manufacturers’ springs are heavily overrated (e.g., an M130 can perform like M140–150) and may exceed the gearbox’s rated strength. Use only the included Specna Arms springs. For other brands, choose around M120 to avoid damage from mislabeled springs.
• If installing a spring with progressive/irregular coils, ensure the tighter coils face the spring guide outward from the gearbox.
• Never store the rifle with the battery connected.
• Never store the rifle with pre-cocking engaged. Always release the piston forward before storage to prevent spring damage.