General Discussion
In reply to the discussion: Legal: AR-15's. Illegal: Marijuana [View all]AtheistCrusader
(33,982 posts)replace it's internal parts with the parts from an M-16 and end up with an M-16. (one that might potentially explode in your hands if the receiver is made of aluminimum, which was never meant to stand up to full-auto-fire, and may stretch and fatigue and shatter)
After 1986 you either need to obtain an original reciever (the component behind the barrel that holds all the guts), manufacture a new receiver, or significantly modify the weapon's internal parts in a manner that is highly hazardous to your health.
In 1986 they required that all new rifles be required to be difficult to convert to full-auto. That means no drop-in ready replaceable parts. Any rifle made that was easy to convert is in the eyes of the BATFE, a machine gun even if it hasn't been converted. And the BATFE has sole jurisdiction over what 'easily converted' means.