I might as well chime in with my opinion too. Full auto bolt carriers are fine now. Colt worked that out with ATF because they wanted to just make the one type and the HK clone makers followed suit behind the AR guys. I've always heard that full auto trigger parts with a semi were considered constructive possession so could get you in trouble. The AR won't work without the machining for the sear so you could put those parts in but it's still a semi. I wouldn't want to be the test case so I think I would advise against keeping semiauto weapons and full auto triggers in the same place.