Glock has built a reputation for building hard use quality firearms and accessories. The Glock MF20115 10mm 15rd replacement magazine 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 15rd 10mm magazine will fit the Model 20 full size, 40 long slide and compact model 29 as well as all generations of Glock 10mm pistols.