Titanium_Frost
Grandmaster
No, because that's just part of the statistic. There are far more semi-auto AR-15's than there are semi-auto mp5 clones. In fact, I've never seen a semi mp5 in real life, and I've seen dozens of semi AR-15's.
It is far less likely that a civillian with "an assault rifle" is actually an NFA item than a civillian with an mp5 lookalike.
This is dependent on your own ignorance of what weapons are out there for private citizen's consumption. Even if it WERE a ful auto NFA item there is no RAS that a crime is being committed.
... and since when are cops not allowed to ask for ID and stamp to enforce NFA items?
Which part? If they have RAS of an infraction or ordinance violation they can get ID otherwise they can go fish.
A TAX stamp is a private tax document that only an officer of the treasury has the authority to inspect. Secret Service, ATF and IRS are the only ones with the authority to verify a tax stamp.
A LEO has the same authority to take a look at your tax returns, but I guess you would hand those over with a smile on your face as well.