Re: "no requirement of 'registration' for deactivated firearms"
I have made several fully functional firearms. With modern tools it is actually not particularly difficult. My favorite is a Model 1894 replica in .357 Herrett. It is an excellent shooter, and my favorite short to medium range varminter and saddle carbine. It was actually easier to machine the carbine than it was to forge the 10 gauge flintlock replica of the original forged by my Great Grandfather.