Quote Originally Posted by JSGlock34 View Post
I think the concern comes into play when someone wants to convert one of the MKE pistols into a MP5 configuration by adding a buttstock (thus creating a SBR). At that point the pistol becomes a rifle, and thus there is concern about 922(R) coming into effect.
If you made the junk MKE pistol into a Title 1 rifle (16" bbl) with a stock I can certainly see how 922(r) would certainly apply.
If you made it into a registered SBR on an approved Form 1 you've instantly removed it from an importable firearm status hence why 922(r) would no longer apply.