Quote Originally Posted by SA Friday View Post
So, the COMPLETED lower must have the relevant information engraved on the lower to be entered. No info, it can't be kept. The owner has to stay with it. 80% shit boxes didn't exist before the requirement for serial numbers. They don't get a free pass as pre-68 guns do.
Of course they do - you simply enter "NSN" for the serial number, as you would for any other legal firearm without a serial number. You are not "required" to work on non-serialled homebuilds, but nothing in federal laws or regulations forbids you from doing so, just your personal preference or business policies.

There is no legal distinction between an unserialled pre-68 firearm and an unserialled post-68 homebuild.