SA M4 Carbine M-LOK (SA-P20 PRIME™ ASTER II ETU BLDC™) – Green

M4 Carbine M-LOK (SA-P20) from Specna Arms in the PRIME™ series in green.

Receiver with Nano Coating.

Reinforced AETHER™ gearbox packed with upgrade parts and a Brushless motor.

Gate ASTER II Bluetooth® control unit and SOLAR™ CNC trigger installed.

MAGNUS™ hop-up unit with TDC adjustment, Flat bucking and a 6.02mm barrel.

3 springs included (M90, M115, M135).

Technical Specifications

• Power system: AEG
• Material: Metal, polymer
• Rifle length: 750–830 mm
• Weight: 2640 g
• Muzzle velocity: 130 m/s (1.7 J)
• Inner barrel length: 315 mm
• Inner barrel diameter: 6.02 mm
• Hop-up: Adjustable (TDC)
• Fire modes: Semi, Full Auto, Binary, Pre-Cocking and more
• Thread: 14mm CCW (counter-clockwise)
• Handguard: M-LOK
• Compatible battery: 11.1V Li-Po (not included)
• Connector: T-Dean
• Compatible battery type: Crane (Buffer stick, Nunchuk)
• Magazine capacity: 125 BBs (Mid-Cap)
• Motor type: Brushless (Specna Arms Dark Matter 27–35k)

Package Contents

• Specna Arms PRIME™ M4 AEG rifle
• 2× S-MAG mid-cap magazines (125 BBs)
• Small Tamiya adapter
• Speedloader
• Iron sights
• M90 spring (CQB)
• M115 spring (standard field)
• M135 spring (DMR setup)
• Specna Arms stickers
• User manual

Warnings

• Springs from some manufacturers are significantly overpowered (e.g., an M130 may behave like M140–150), possibly exceeding gearbox durability. We recommend using only the included Specna Arms springs. For other brands, M120-class springs are recommended to avoid damage.
• If installing a spring with progressive (irregular) winding, ensure the tighter coil end is placed on the spring guide facing outward.
• Never store the rifle with the battery connected.
• Never store the rifle with pre-cocking active. Always release the piston before storage to avoid spring wear.

Gate Control Station (GCS) App Download

• Android
• iOS
• Windows/Mac

Pairing the App

To pair the GCS app with the ASTER II unit, you must enter its code located on the wiring label. Do not remove this label, or store it safely. Without the code, pairing with the app is not possible.