Some Class III weapons

Probably someone's Short Barreled Rifle upper receiver coupled with an M16A1 lower. IIRC you can put any size barrel on an NFA weapon with one tax stamp, 556 would know for sure though.
 
It's a civilian snubby upper with a full-auto Pre '86 M16/M16A1 lower.

With NFA Class III Weapons you have to pay a $200 tax stamp on them.

Short Barreled Rifles (rifles with a barrel less then 16 inches and a overall length of 26 inches)

Short Barreled Shotguns (shotguns with a barrel less then 18 inches and a overall length of 26 inches)

Full-Auto (Any firearm that will fire more then one round with the pull of a trigger). Full-Autos negate the need for a tax stamp of barrel length since it is already payed as a Class III $200 for the fact that it is a full-auto.

Suppressors (Any suppressor sold to civilians require a $200 NFA Tax Stamp)
 
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