These Glock OEM replacement magazines are for Generation 5 and earlier Glock 17 / 19X / 34 pistols. A hardened steel insert encased in slick, wear-resistant polymer gives each Gen5 magazine impressive strength and durability. The difference is the polymer for these mags is molded in Glock’s desert-ready Coyote color. Inside, the contrasting black follower makes keeping track of load status through the plentiful witness holes easier, while the extended, angled baseplate helps with those fast magazine changes.