Since this thread is now in the NFA forum, I will ask these questions.
Has anyone ever shot both a genuine factory HK MP5 and an NFA MP5?
If you have, can you tell the difference?
I own several NFA MP5s, but I've never really shot a factory MP5 (I once about 15 years ago shot a factory LE MP5, but that was before I knew about NFA machine guns, so I don't remember enough to compare).
FYI, there are no known factory MP5s in the NFA registry. There are rumors of such guns, but they're only rumors. The closest you can come is a double push pin MP5. All NFA MP5s are conversions. Source:
http://www.machinegunpriceguide.com/...k_nfa_conv.HTM
Obviously, the gun in the Secret Service pic is a factory MP5.