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

Why Choose the Specna Arms M4 CQB RL M-LOK FLEX™ BLDC™ Gen2?

This professional product description was prepared by the expert team at ANAREUS.cz. All rights to this unique content are reserved by anareus.cz.The Specna Arms M4 CQB RL M-LOK Gen2 (SA-F04-RL FLEX™ BLDC™ HAL ETU™) is built around the lightweight yet highly durable RL AR15 FLEX™ nylon receiver reinforced with glass fiber. It offers a realistic matte finish while being more durable than inexpensive cast alloy receivers. This model belongs to the RL SAAS (Specna Arms Accessory System) series, featuring a more aggressive design that stands out from traditional AR15 receivers. The reinforced nylon outer barrel with a 14mm CCW thread, together with steel components such as pins, screws, and the ejection port cover, provides strength where it matters most. The result is an exceptionally lightweight yet robust assault rifle, perfectly suited for CQB environments and fast-paced gameplay. The familiar AR15 (M4) controls ensure intuitive handling, including an ambidextrous charging handle, user-friendly fire selector, and easy hop-up adjustment through the ejection port. The M-LOK handguard allows mounting accessories such as a vertical grip, weapon light, or PEQ box. The new Light Ops stock features a rubber cheek rest and integrated QD sling sockets while keeping the overall weight low. The battery is housed inside the buffer tube, requiring a Buffer Stick battery. Overall, this rifle combines low weight, modern construction, and outstanding Gen2 internal components in an affordable platform. The FLEX™ Gen2 series impresses with excellent build quality, featuring the premium Æther™ gearbox, modern HAL ETU™, metal air nozzle, TDC hop-up chamber with a Helium™ flat hop bucking, and a 6.03 mm precision inner barrel. The entire BLDC™ (Brushless Direct Current) system is powered by the precise Dark Matter brushless motor running at 27,000 RPM. It delivers higher efficiency, improved performance, faster trigger response, and an increased rate of fire, while providing up to five times more shots per battery charge compared to conventional motors. The rifle also includes the beginner-friendly Specna Arms EASY LIPO CHARGER and a powerful 11.1V 1000mAh Buffer Stick Li-Pol battery.

Key Features of the Specna Arms M4 CQB RL M-LOK FLEX™ BLDC™ Gen2

Technical Specifications

• Platform: M4 / AR-15
• Series: FLEX™ BLDC™ Gen2
• Length: 670–750 mm
• Weight: 2125 g
• Inner barrel length: 235 mm
• Power source: AEG (Electric)
• Electronic unit: HAL ETU™
• Gearbox: Reinforced Æther™ V2 QSC
• Quick spring change: Yes (ESA™)
• Motor: Brushless (long type)
• Hop-up: TDC
• Inner barrel: 6.03 mm
• Muzzle velocity: 115 m/s
• Bearings: 8 mm ball bearings
• Connector: T-Dean
• Receiver material: Glass-fiber reinforced nylon
• Handguard material: Glass-fiber reinforced nylon
• Handguard interface: M-LOK
• Thread: 14 mm CCW
• Included battery: Specna Arms 11.1V 1000mAh Li-Pol (20C)
• Included charger: Specna Arms EASY LIPO CHARGER for 7.4V (2S) / 11.1V (3S) batteries

Package Includes

• Specna Arms M4 CQB RL M-LOK FLEX™ BLDC™ Gen2
• 2× S-MAG mid-cap magazines (125 BBs)
• Flip-up iron sights
• M90 spring
• Specna Arms stickers
• User manual
• 11.1V Li-Pol battery
• EASY LIPO CHARGER

Important Before First Use

Before firing the rifle, you must activate the HAL ETU™ by following these steps exactly. Otherwise, the rifle will not respond after connecting the battery.

1. Set the fire selector to Safe.
2. Connect the battery and wait approximately 3 seconds until you hear a beep.
3. Pull and hold the trigger for 5 seconds until you hear another beep.
4. Your rifle is now ready to use.

Frequently Asked Questions (FAQ)

How should I charge the battery?

The battery features both a T-Dean connector and a balance connector. First plug the charger into the power outlet, then connect both battery connectors to the charger. Charging stops automatically when complete and the green indicator lights up. Disconnect the battery first, then unplug the charger. Always handle the balance connector carefully and avoid reversing the polarity of the T-Dean connector.

What does BLDC™ mean?

BLDC™ identifies Specna Arms models equipped with the Dark Matter brushless motor. Compared to standard motors, it delivers higher efficiency, improved performance, faster trigger response, increased rate of fire, and up to five times more shots from the same battery. The motor features an aluminium housing and is rated for springs up to M190, although the gearbox itself is designed for M120–M130 setups.

How durable is the nylon receiver compared to metal?

The glass-fiber reinforced FLEX™ receiver is surprisingly strong and often more impact-resistant than inexpensive cast alloy receivers. It is perfectly suitable for regular and demanding gameplay, although it does not provide the same cold metallic feel as a full-metal rifle.

Should I upgrade it immediately?

In most cases, no. The Gen2 internals—including the Æther™ gearbox, TDC hop-up chamber, and 6.03 mm precision barrel—already provide excellent performance for this class of rifle. Upgrades usually become worthwhile only after identifying your preferred playing style, with the hop-up bucking or spring being the most common first modifications.