AEG Battery Butt Compartment

AEG Battery Butt Compartment aka APS Patriot butt tube

reference picture from http://img01.militaryblog.jp/

making a butt battery compartment from a refillable ketchup cylinder container

sample picture of a ketchup refillable container

look for a plastic butt adaptor, same as the pics and attached the cover of the ketchup container and your done!

finished m4 butt battery compartment

or you can also use a pvc cover & an empty silicone sealant container...enjoy your battery compartment