These magazines were designed for professional shooters and law enforcement personnel whose lives depend on a perfect shot every time. Expertly machined for exceptional quality and guaranteed to feed and function for every shot. This 40 round magazine isfor most Kalashnikov AK-47 pattern firearms chambered in 7.62x39mm. The magazine body and follower are constructed of a proprietary DuPont Zytel based polymer to ensure a long service life.