Airtech Studios Amoeba Battery Extension Unit Color:Black This is a replacement hop

This is a replacement hop up chamber for all M4 type AEG airsoft guns

5 in plates/foam

Velcro loop attachments for putting all your snarky patches on

A great upgraded piston that will handle a lot

Airtech Studios Amoeba Battery Extension Unit Color:Black This is a replacement hopThe Airtech Studios Amoeba Battery Extension Unit is designed to fit on Amoeba AEG guns: AM13, AM14, and AM15. Comes in either black or dark earth tan colors. 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. Can fit