I am not for certain but I think this started when I redeemed my LE code. At this point in the game, whatever weapon I'm carrying has an odd graphics bug that makes it look like it's trying to be in stealth mode around the edges, plus the sight bounces weird. Also I am carrying 3 main weapons, ie a shotgun, sniper rifle and the machine gun. The machine gun can never be full ammo. It's like you can only ever carry one clip. I've tried exchanging every weapon for a machine gun and it stays like that constantly.

My specs if it matters. i7 950, 12 gb ram, gtx 465. Way more than enough system.