Quote Originally Posted by Irving View Post
They are easily converted in just a few minutes, just not legally.
Even with a registered drop-in auto sear, I believe you still need to swap out the hammer, disconnector, selector switch, and bolt carrier. An illegal auto sear would need to be fabricated, which would require tools, skills, and several hours of labor. Replacing the internals of the lower would require replacement parts and would take at least another hour. The AR-15 is one of the more difficult semis to convert, and easy to screw up.