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

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™) features the lightweight yet highly durable FLEX™ RL AR15 nylon receiver reinforced with fiberglass, providing a realistic matte finish while being stronger than inexpensive cast alloy receivers. This model belongs to the RL SAAS (Specna Arms Accessory System) series, giving it a more aggressive appearance that stands out from standard AR15 receivers. The nylon outer barrel features a 14mm CCW thread, while steel components such as screws, pins, and the ejection port provide additional durability where it matters most. The result is an exceptionally lightweight yet robust assault rifle that excels during CQB games and fast-paced gameplay. The familiar AR15 (M4) controls ensure intuitive handling, complemented by an ambidextrous charging handle, an easy-to-use fire selector, and convenient hop-up adjustment through the ejection port. The M-LOK handguard allows the installation of accessories such as a vertical foregrip, weapon light, or PEQ box. The new Light Ops stock features a rubber cheek rest and integrated QD sling attachment points while maintaining the rifle's low overall weight. The battery is housed inside the buffer tube, requiring a Buffer Stick battery. Overall, this rifle combines low weight, modern construction, and excellent Gen2 internals into one affordable platform. We particularly appreciate the FLEX™ Gen2 series for its outstanding build quality, featuring a premium Æther™ gearbox with the advanced HAL ETU™, a metal air nozzle, a TDC hop-up chamber with a Helium™ flat bucking, and a 6.03 mm precision inner barrel. The entire BLDC™ (Brushless Direct Current) system is powered by a precision Dark Matter brushless motor spinning at 27,000 RPM. The brushless motor delivers higher efficiency, improved performance, faster trigger response, and an even higher rate of fire, while providing up to 5× more shots per battery charge compared to conventional motors.

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: 2,125 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: Fiberglass-reinforced nylon
• Handguard material: Fiberglass-reinforced nylon
• Handguard type: M-LOK
• Thread: 14 mm CCW

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

Important Notice Before First Use

Before firing the rifle, you must activate the HAL ETU™. Follow 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 for use.

Frequently Asked Questions (FAQ)

Which battery is recommended for this rifle?

To fully utilize the HAL ETU™, we recommend an 11.1V Li-Pol or Li-Ion Buffer Stick battery that fits inside the stock buffer tube.

What does BLDC™ mean?

BLDC™ designates Specna Arms rifles equipped with the Dark Matter brushless motor. A brushless motor provides higher efficiency, improved performance, faster trigger response, and a higher rate of fire while delivering up to five times more shots per battery charge than traditional brushed motors. It is housed in a durable aluminum casing and is capable of handling springs up to M190 (although the gearbox and internal components are designed for approximately M120–M130 setups).

How durable is the nylon receiver compared to metal?

The fiberglass-reinforced FLEX™ receiver is surprisingly rigid and more durable than inexpensive alloy receivers. It is perfectly suited 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?

Generally, no. The Gen2 internals—including the Æther™ gearbox, TDC hop-up, and 6.03 mm precision barrel—are already excellent for this price range. Future upgrades are usually based on personal preferences, most commonly the hop-up bucking or spring.