You likely know this, but be careful making functional firearms. Weapons that can fire fully automatically lead quickly to prison time without extensive permits. That's aside from the more mundane dangers from explosions.
Per Secura, you're best bet is a smaller manufacturer of rifles. Magpul, I believe, just makes accessories. But there are a lot of smaller manufacturers who might pay attention to a good idea and presentation - though I'd imagine they get lots of stupid ideas from lots of foolish people, meaning they have screening systems anyone with a good idea would have to get through.
CR
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