The Glock 43X / 48 9mm 15-Round Factory Steel Magazine is a reliable factory magazine designed for use with Glock 43X and 48 pistols and is ideal for training and target practice. This factory magazine features a durable polymer follower and a high-quality steel spring for smooth, reliable feeding, and it boasts clear witness holes for quick, at-a-glance round counts on the fly. Engineered to withstand serious abuse under the most extreme conditions, Glock factory magazines just keep on running. Plus, this magazine features a hardened steel exterior for superior strength and lasting corrosion resistance.