Specna Arms M4/M16 SA-F05 FLEX Gen.2 BLDC AEG Airsoft Assault Rifle 12.5" (Advanced Combat Stock) – Half-Tan

The Specna Arms SA-F05 FLEX Gen.2 is an electric airsoft replica based on the M4/M16 platform, equipped with a programmable HAL™ ETU, a Specna Arms Dark Matter™ High Speed 27–35k brushless motor, and the new Advanced Combat Stock.

The FLEX Gen.2 series was developed to provide players with airsoft replicas combining good performance, functionality, and an attractive price. The construction solutions used are designed to ensure reliable operation and user comfort during airsoft games.

External Construction

The replica features a nylon receiver and a 10.5" nylon M-LOK handguard. The pistol grip, buffer tube, adjustable stock with a rubber buttpad, and iron sights are made from the same material.

Aluminum components include the muzzle device, outer barrel, controls, and charging handle. The replica is equipped with an ambidextrous fire selector, ambidextrous magazine release, and functional bolt catch.

The pins, screws, and QD sling attachment points are made of steel.

The replica features an adjustable Advanced Combat Stock with a textured rubber buttpad. It allows the user to maintain a comfortable shooting position while retaining good control over the carbine.

Hop-Up and Internal Components

The replica is equipped with a rotary TDC Magnus™ Hop-Up chamber (Top Down Center), allowing precise and stable adjustment of BB backspin. The chamber's design is protected under European protection right number 015052069-0001.

The chamber works together with a Helium™ Flat Hop Hop-Up bucking, designed to help provide consistent BB backspin.

Additionally, the replica features a sealed aluminum nozzle and a 6.03 mm diameter inner barrel.

Other internal components include:

• 8 mm solid bushings

• Steel gears

• Polycarbonate piston with a full steel tooth rack

• Specna Arms Dark Matter™ High Speed 27–35k brushless motor

Æther™ Gearbox and ESA™ System

The replica is equipped with a reinforced Æther™ gearbox shell, whose design is protected under European protection right number 015044865-0001.

The gearbox shell features the following solutions:

• Main spring tension release function

• Pre-cocking and AoE inspection windows

• Reinforced front section of the gearbox shell

• Inspection windows facilitating gear shimming

• Trigger adjustment capability

• Screw holes enabling precise gearbox shell alignment

• Construction designed to accommodate springs up to M140

The integrated ESA™ quick spring change system makes it easier to adjust the replica's muzzle energy to the requirements of an airsoft game without disassembling the entire gearbox.

Programmable HAL™ ETU

The HAL™ electronic unit uses magnetic sensors based on the Hall effect to detect trigger movement. It allows the replica's operating characteristics to be adjusted according to user preferences.

HAL™ features:

• Magnetic trigger detection based on the Hall effect

• Active motor braking

• Binary Trigger mode

• Adjustable trigger sensitivity – 5 levels (20–100%)

• Adjustable pre-cocking – 6 levels

• Programmable AUTO modes: Full Auto, Semi, 3-Round Burst, 5-Round Burst

• Programmable SEMI modes: Semi, Binary, AUG, Sniper

• Trigger-based programming

• Low battery warning

• Compatibility with brushless motors

Dark Matter™ BLDC Brushless Motor

The replica is equipped with a Specna Arms Dark Matter™ High Speed 27–35k brushless motor.

BLDC (Brushless Direct Current) technology eliminates conventional motor brushes, reducing wear on the components responsible for electrical commutation.

Key advantages of a BLDC motor:

• No sparking at motor brushes

• Reduced mechanical wear due to the absence of brushes

• High energy efficiency

• Stable performance at high rotational speeds

• Reduced heat generation

• High torque

• Fast trigger response

• Ability to operate with stronger springs when the system is appropriately configured

Product Features

• Lightweight construction with a nylon receiver

• 10.5" M-LOK handguard

• 12.5" outer barrel

• Adjustable Advanced Combat Stock

• Ambidextrous fire selector and magazine release

• Functional bolt catch

• Folding iron sights

• TDC Magnus™ Hop-Up chamber

• Helium™ Flat Hop Hop-Up bucking

• 6.03 mm inner barrel

• Reinforced Æther™ gearbox

• 8 mm solid bushings

• Steel gears

• ESA™ quick spring change system

• Programmable HAL™ ETU

• Dark Matter™ High Speed 27–35k brushless motor

Package Includes

• Specna Arms SA-F05 FLEX Gen.2 replica

• 2 S-MAG Mid-Cap magazines

• Cleaning rod

• Allen key

• Mini Tamiya to T-Deans adapter

• BB speedloader

• Additional M90 spring

Not Included

• Battery

• Battery charger

Note – First Activation of the HAL™ Unit: After connecting the battery, set the fire selector to SAFE and hold the trigger for approximately 5 seconds to activate the HAL™ unit.

Note: To reduce the risk of malfunction, we recommend using a 7.4 V battery when operating the replica with the M90 spring.