Instructables
Picture of AEG Battery Butt Compartment
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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
 
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Step 1:

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sample picture of a ketchup refillable container

Step 2:

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Step 3:

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

Step 4:

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finished m4 butt battery compartment

Step 5:

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or you can also use a pvc cover & an empty silicone sealant container...enjoy your battery compartment
astral_mage11 months ago
butt, butt.
maomag (author)  astral_mage11 months ago
yeah front butt and rear butt hahaha