I purchased a new AR556 yesterday at a LGS, which was on sale for Black Friday. After I got the gun home today, and unboxed it, I discovered it is a State Compliant rifle, I think. Please don't harp on me for not inspecting the rifle prior, but it was a mad house there, and there was not one on the shelf out of the box to look at. I realize, I made a dumb mistake. Anyway, this was purchased in Indiana, a non Compliant state. The barrel is not threaded, no flash hider, the stock is not adjustable. The gun came with a Pro Mag 30 round magazine. I read the state compliant guns come with a 10 round metal magazine. This is what has me puzzled. Why would it have the 30 round magazine, but the other state compliant features are included? Do all the AR556 rifles come with Pro Mag magazines? The ID # on the box does include SC. Sure wish I would have researched a little more before I made this purchase.