Many times I have found that magazines get glitched out and stuck on the ground or inside firearms. When this happens, you can not remove the ammunition from the magazine or remove it from a weapon or put the magazine in your inventory. In the case of them getting stuck in rifles and pistols I have already had to throw away 3 m4s an ak74 and a scorpion AMG. It is bad enough that I have actually been resorting to carrying only an sks due to its internal magazine.