Airtech Studios G&G ARP9 / ARP556 BEU Battery Extension Unit Sights It is very easy to

It is very easy to handle and fun to use

300 fps w/

High capacity (Hicap) magazines usually hold 150 rounds or more

Upgrade your stock spring with this big upgrade

and the G&G Firehawk AEG

Airtech Studios G&G ARP9 / ARP556 BEU Battery Extension Unit Sights It is very easy toThe Airtech Studios G&G ARP9 ARP556 BEU Battery Extension Unit is designed to fit on G&G ARP series of AEG guns: fits on the ARP9 and ARP556. Very easy to install so you can add longer and bigger batteries in your rear stock buffer area. With it installed, you can use 9. 6v 1600mah nun chuck, and any longer 11. 1v batteries in it, with extra room to spare. This is a must have for those that want flexibility with battery space. For the ARP9 and ARP556,