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I was just gonna say... lol
I don't know any forward assists that are mechanically linked to the tappet plate. But they're all spring loaded so you can push it, it just doesn't do anything
And what do you mean "barrel extension comes off"
Like you want a CQBR, or you want to transition between short and long barrels?
Or do you mean the flash hider?
Inherently all mechboxes make noise. It takes a lot of doing to make them really quiet. If you REALLY want something quiet, you might want to look into polarstar kits
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