This is an Elite Tactical Systems CLEAR 170mm/19-round extended competition magazine for Glock .40 S&W pistols Featuring translucent polymer construction with ergonomically-designed baseplates and steel internal springs, these 170mm ETS magazines are designed to provide competition-ready performance right out of the box. Elite Tactical Systems’ unique clear magazines are the perfect upgrade for your Glock pistol. Crafted from advanced polymers that are ultra-resistant to cracking, breaking or warping, ETS magazines are robust, reliable, and designed to be stored loaded without concern for wear and tear on the magazine. These magazines are compatible with all double-stack .40 S&W Glock pistols form Gen 1 through Gen 5. Each ETS magazine is made in the USA and comes with a Lifetime Guarantee. Add a few 170mm magazines to your competition kit today!