Do I need to elaborate? on a semi auto post ban firearm with a detatchable mag you can have one of the following - Pistol grip,threaded barrel, folding and/or collapsable stock, bayo lug, grenade launcher (think yugo sks type) Since I most ar and ak type firearms have a pistol grip ~ Stock cannot colapse, but there is no regulation on stock length. So I can have a stock the same length as a collapsed 6pos. stock as long as it cannot move. But I cant have a std. stock 6pos. stock. (the shoulder thingy that goes up) We can not have a thread bbl. But we can pin a muzzle brake. No bayo lug. (Didnt you hear about all those drive by bayonetings?) No flash hider, must be a muzzle brake. We can have >10rd mags made september 10 1994 but not made on sept. 12th 1994 (The new ones are soo much more dangerious, I heard they can kill you while you sleep. It really is for our own good, the gov't needs to protect us from ourselves.) They tried to ban .50 cal rifles, b/c they were too large. But I would need a license to buy a handgun, because they are too small.