Firearms with full auto features generally have an auto sear which is tripped when the action is safe to fire. That is, some sort of lockup is accomplished by the bolt. This ensures that the firearm is safe and that the shooter goes home with the same number of digits and eyeballs as at the start of the day. Home gun plumbing a semi into full auto is not only illegal, unless done for the military, police or export - all of which is preapproved by the BATF - but requires a high level of expertise, experience and craftsmanship. It is not a task to be undertaken by novices.
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