>>3You don't have to register shit unless the local laws say so. Federally the only thing that you can't do in terms of homemade firearms (without a fuckton of background checks, paperwork, fees, and waiting periods) is manufacture NFA firearms. I'm planning on making an Irish Trombone just to say I did. It'd be pretty cool to have a rusty 12 gauge slampiggy sitting on the mantle. Also 3d printed lowers and frames make my dick hard.
>pic related