The WarneA(R) Magazine Extension Kit replaces your G17 or G22 PMAG's existing baseplate to give your Glock a major capacity "boost." Made from anodized aluminum, the Extension Kit features an ergonomic shape that's comfortable in your hands and allows for easier mag swaps. PLEASE NOTE: Magazine not included. Fits PMAGA(R) GlockA(R) 17/22 magazines Provides +5 capacity when used with 9mm, +4 capacity when used with .40 S&W Includes Extension and spring Made from anodized aluminum Ergonomic shape allows for better insertion/removal and comfortable shooting Meets USPSA 141.25mm legal length Designed and made in USA Order today!