Looking into building my second sbr, but first in .22lr and was wondering what my limitations are. What does my overall length have to be? Can I put a folding stock onto it and also have a flash hider? The barrel I am using is the the cmmg 4.5".
My understanding is that OAL and evil feature requirements apply to centerfire rifles, not rimfire so I think you're good. There is another thread on this and the recommended steps.