AIRTECH STUDIOS ARP9 / 556 BEU Battery Extension Unit Black

One of the main problems encountered with G&G ARP 9 and ARP 556 AEG is the limited space for the battery.

Once the battery is installed in the cylinder head compartment, it is difficult to reposition the MOSFET, fuse and wires inside without risk of over flexing (which weakens the circuit over time). Similarly, we wanted to minimize the possibility of damaging the battery surface due to the tightness of the available space.

The Battery Extension Unit (BEU) is specifically designed to provide additional space within the compartment by relieving all stresses on the ARP 9 & ARP 556 components, while protecting them to extend their durability. The BEU unit has ventilation holes on both sides to maintain a constant flow of ventilation to the battery and components preventing overheating.

The BEU unit is designed to fit perfectly with the original design of the ARP 9 & ARP 556 and requires no modifications for installation. It is made of strong, flexible and impact resistant nylon fiber reinforced plastic from BBs.


- Increased space for the MOSFET and wires to avoid bending or damage.
- Increased battery capacity
- Eliminates stock instability by blocking the two metal rails
- Maximum battery size: approximately 152 mm length x 19.5 mm width x 11.75 mm height
- Once installed, the ARP 9 or ARP 556 remains as compact as before, perfect for CQB use!
- Also Compatible with G&G CM16 Raider L 2.0E