These high capacity 30 round mags are not the cheap imitations sold at the gun shows but high quality mags, matched to fit the M-11 SMG & semi auto. Each mag is disassembled, feedlips are machined evenly, front of the feedlips are cut back similar to a zytel for fit, deburred on the inside, the followers are checked for smooth movement, each spring is inspected and oiled. They are parkerized steel mags that outlast the zytel plastic mags. They last longer without wearing down the feedlips and they are notched for the magazine catch. They perform the same if not better than plastic mags and most competitive shooters prefer steel. Also, if you are looking for the perfect pouches to carry these for competition or just shooting, our SMG pouches are a perfect fit for these magazines. Also available as a rebuild kit.