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I guess that would be fine, so long as you don't have a free standing pistol grip, like this one: https://www.youtube.com/watch?v=ElgTP3c-XcQ

I was thinking of doing that and buying an upper and a...

That's great, thanks a lot.

This is probably a dumb question, but what is a P2P?

I thought it might be a fun hobby project to try put together a single shot .22 rifle, but I can't find anything solid on the legality. It's obviously illegal to make pistols and restricted weapons,...