GLOCK OEM Plus Two Magazine Extension Does Not Include Mag Insert 9MM 40S&W & 357 SIG Black Not G43 Must Purchase OEM Magazine Extension Insert. . Developed working with some of the most extremely heavy duty and dependable components available these Pistol Magazine Extensions from Glock will provide you with an item which gives you years of reliability. Glock has been making superior quality products for a number of years and the Glock OEM 9MM 40S&W & 357 SIG Plus Two Magazine Extension is their very own means of showing you how much they care. Right here at OpticsPlanet we ensure that it is our responsibility to receive the best product for all your requirements and featuring the Glock OEM 9MM 40S&W & 357 SIG Plus Two Magazine Extension is a thing that we are pleased to offer. Specifications for Glock OEM 9MM 40S&W & 357 SIG Plus Two Magazine Extension: Manufacturer: Glock Color: Black Finish: Black Magazine Capacity: 0 Round Caliber: .357 SIG 9mm Luger .40 S&W Gun Make: Glock Additional Features: Mag Extension Does Not Include Mag Insert Package Contents: Glock OEM 9MM 40S&W & 357 SIG Plus Two Magazine Extension