Glock has built a reputation for building hard use quality firearms and accessories. The Glock MF30010 .45ACP 10rd replacement magazine for the model 30 is made to the same standards as all other Glock magazines. Steel liner with a super tough polymer coating, the steel liner provides a rigid frame so the spring tension won't cause the polymer to bulge. While the polymer coating adds the protection of scratch and impact resistance that Glock pistols and magazines have been known for. The 10rd .45ACP magazine will fit the Model 21 full size, 41 long slide and compact model 30 as well as all generations of Glock .45ACP double stack pistols.