One of the main problems with G&G ARP 9 and ARP 556 AEG is the limited space for the battery, cables and MOSFET. When the battery is put in the stock compartment it is difficult to neatly insert the cables, MOSFET and fuse without running the risk of bending or damaging things.

The Battery Extension Unit (BEU) has been specially designed to create just that little bit of extra space so that you will not have any problems installing the battery and you can even install larger capacity batteries.

The ventilation openings on both sides allow the heat that can be generated when using the battery to escape. Designed to perfectly match the original design of ARP 9 and ARP 556, the BEU unit requires no modifications to the replica or to the product and is also compatible with G&G CM16 Raider L2.

It is made of durable and impact resistant ABS plastic reinforced with nylon fibers for extra flexibility and strength. Maximum battery size: about 152mm long x 19.5mm wide x 11.75mm thick. Once installed, the ARP ARP 9 or 556 remains as compact as before, perfect for use during CQB!