JL Billet 9/40 Glock Double Stack Magazine Extension Black Black 0. 40 S&W and 9mm caliber Specifications for JL Billet 9/40 Glock Double Stack Magazine Extension: Manufacturer: JL Billet Color: Black Fabric/Material: 6065 Aluminum Finish: Type III Hardcoat Anodized Magazine Capacity: 5 Round Caliber: 9mm Luger .40 S&W Gun Make: Glock Gun Model: Glock 35 Glock 34 Glock 22 Glock 17L Glock 17 Glock 27 Glock 23 Glock 19 Glock 19X Glock 26 Condition: New Features of JL Billet 9/40 Glock Double Stack Magazine Extension The JL Billet magazine extension is hard anodized to take whatever your situation requires while being a combination of aesthetics and function to give you a competitive edge no matter the situation. Package Contents: JL Billet 9/40 Glock Double Stack Magazine Extension What firearm models does the manufacturer say JL Billet 9/40 Glock Double Stack Magazine Extension is compatible with? The manufacturer suggests that JL Billet 9/40 Glock Double Stack Magazine Extension is compatible with Glock 19 Glock 23 Glock 26 Glock 27 Glock 17 Glock 17L Glock 22 Glock 34 Glock 35 Glock 19XJL Billet JLB-MAG-EXT-G-B-2/3: 9/40 Glock Double Stack Magazine Extension Black Black