Shoot more and reload less with the ProMag® Glock® 43X / 48 9mm 28-Round Blued Steel Magazine. This aftermarket magazine is constructed with heat-treated steel and features a corrosion-resistant black oxide finish for dependable strength and lasting field use, especially in tough environments. What's more, a polymer catch insert allows the use of a factory Glock mag catch with no modifications needed. The heat-treated chrome silicon wire spring and injection-molded polymer follower provide smooth, reliable feeding and proper cartridge alignment to help prevent jams, double-feeding, and other weapon malfunctions while at the range. If that's not enough, this magazine is backed by a lifetime warranty from ProMag so you can enjoy your hobby for years to come. Order a couple of backup mags today! Made in USA.