The ProMag GLK-A19 Magazine delivers reliable feeding with its 15-round capacity and heat-treated steel construction. Built for Glock 48 and 43X pistols this aftermarket magazine combines durability with extended capacity performance.ProMag GLK-A19 15-round 9mm magazine for Glock 48/43XHeat-treated blue steel body with black oxide finish for corrosion resistanceInjection-molded polymer follower for smooth feedingHeat-treated chrome silicon wire spring for reliable functionPolymer catch insert design compatible with factory Glock magazine catchMade in USA with lifetime guarantee against manufacturer defectsPerfect for shooters seeking extended capacity beyond standard 10-round factory magazines this ProMag magazine provides a cost-effective solution for Glock 48 and 43X owners. The steel construction offers enhanced durability for training competition or personal defense applications. Note: This magazine is specifically designed for slim-frame Glock models and is not compatible with standard double-stack Glock pistols.