m4 charging handle v2

the inside may get stuck but you can just either reduce the flow, or clean up with a long thin file/rod. The V2 has the handle off to the right side, and the left version has it off to the left. even with this on you can still charge it the same way as an m4, or use the handle that also acts as an ambidextrous handle. it has a built in trench sight (i don't know if that is the official name) as well as a full rail system. Finally, you can also put PEQ boxes under the front. (disclaimer: the top rail isn't the strongest thing in the world and mainly there for the looks and flow of the gun, although you can add attachments, I wouldn't suggest it)

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