KCI USA invests in high tech quality control. Our all-steel construction and a curved mag bodies provide reliable feeding of all 30 rounds. The KCI 30-round H&K magazine works with H&K MP5 pattern firearms including: the MP5k, SP89, SP5K Zenith, MKE, Omega, POF, HK Contract MP5 variants, SW5, BW5, CA94, D54, V94, clones, and AR builds. At KCI USA, we shoot our magazines, a lot. Located in Las Vegas, we provide magazines to the biggest machinegun rental ranges in the world.