Home Made Carbine Questions.
I am in the middle of drawing a prototype of what I call the AT-9.
It will be a 9mm carbine with a blowback semiauto configuration.
I need to know what legally has to be featured to make it okay to have a buttstock.
As in what overall length it must be and what barrel length has to be to not be considered an SBR.
Also, do you think a lcking type bolt would be a must for it to work in .45?
Because I am thinking of designing it in .45 instead so I can use the M1911 magazine to build it. I wanna use an existing magazine and I love the .45.