"Class III NFA firearms"
Can somebody please give me a decent definition for this? Or at least update the wikipedia page
http://en.wikipedia.org/wiki/Class_III_NFA_firearm
Any firearm that is controlled under the very restrictive Title 2/Class III provisions of the National Firearms Act, rather than the Title 1 provisions that govern ordinary civilian firearms. Possession of a Title 2/Class III weapon without Federal authorization (BATFE Form 4) is a 10-year Federal felony, and you have to jump through some hoops to get a Form 4.
Title 2/Class III guns include all automatic weapons, sound-suppressed firearms, firearms over .50 caliber (except shotguns and some over-.50 hunting rifles), rifles with barrels shorter than 16", shotguns with barrels shorter than 18", rifles or shotguns shorter than 26" overall length, smoothbore handguns, shoulder-stocked handguns (some antiques excepted), disguised firearms (cell phone guns, cane guns), explosives, grenades, gun-type grenade launchers, etc. etc. etc.
Title 1 guns are non-automatic firearms under .50 caliber that meet the other requirements of the NFA. Your local gun store carries Title 1 firearms; only specially licensed Class III dealers can sell Title 2 weapons, and only to military/police departments or approved individuals with Form 4's.
(FWIW, I started a Wikipedia article. It's probably a duplicate of some of the other, better articles on the NFA, but it's there, anyway.)