Quote Originally Posted by flygrimm View Post
More inconsistencies. …. What about the whole HK series? I don’t have one of those.

Stuart
That's another can or worms. The serial is on the upper with the barrel and bolt, the fire control group including the hammer is removable underneath like a pinned lower. No big deal, that's the easy part.

The ATF screwed the pooch long ago when they determined that the only difference between a semi and full auto would be the welded shelf over the front pin that connects the lower half containing the fire control group. Generally speaking, an HK full auto bolt carrier is legal, as is an HK full auto fire control group, just don't try and fit the auto FCG in with the semi-auto shelf, that's an expensive court date!

**The above is a glossy overview. The intricacies of HK manufacture dates, registered parts, registered guns, and self/pin combos can get VERY complicated. Please consult a knowledgeable FFL before digging yourself a deep hole!