I once talked to the ATF about using an M16 BC in my AR.
They were very polite and helpful. The law is that the rifle may not fire more than 1 shot per trigger pull. As long as it doesn't, you are reasonably good to go. However:
1. They discourage you to have auto parts in there on the basis that a failure of a part that makes you full auto leaves you with an illegal weapon. The rationale is that the fewer auto parts you have, the less likely of having an accidental full auto. This was advice, not the law.
2. Looking like full auto can draw a lot of extra attention that you may not want.
3. The exact basis for interpretation is beyond me, but if you are semi auto, but just barely, and the conversion is easy, there is something called 'constructive intent', where you get busted for looking like you intended to go there.
Don't take this as legal advice.
They were very polite and helpful. The law is that the rifle may not fire more than 1 shot per trigger pull. As long as it doesn't, you are reasonably good to go. However:
1. They discourage you to have auto parts in there on the basis that a failure of a part that makes you full auto leaves you with an illegal weapon. The rationale is that the fewer auto parts you have, the less likely of having an accidental full auto. This was advice, not the law.
2. Looking like full auto can draw a lot of extra attention that you may not want.
3. The exact basis for interpretation is beyond me, but if you are semi auto, but just barely, and the conversion is easy, there is something called 'constructive intent', where you get busted for looking like you intended to go there.
Don't take this as legal advice.
