Built for reliability, the Zenith Firearms ZF-5 magazine has been extensively tested with a range of roller-delayed blowback firearms, including many thousands of rounds of full auto fire. The ZF-5 magazine offers an all steel construction with exceptional welds, and a durable electro-plated black finish. A slick chromed steel follower ensures consistent feeding. The ZF-5 30 round magazine is compatible with in spec MP5/MP5K-style firearms. Each magazine includes Zenith's lifetime warranty to the original owner against manufacturing defects. Mfg: Zenith Firearms