Shield Arms Glock 17 9mm Luger 17 Round Pistol Magazine with 5 Round Magazine Extension Black 7BF3FA5B. Their unique easy access floor plate design allows you to quickly access the spring and follower without having to remove the extension from the magazine body. Comes with a 100percent lifetime warranty and the Shield Arms Spring for Lifeguarantee.Disclaimer Use of this extension with the Glock 19X requires removal of the pistol's lanyard loop. Specifications for Shield Arms Glock 17 9mm Luger 17 Round Pistol Magazine with 5 Round Magazine Extension: Manufacturer: Shield Arms Caliber: 9mm Luger Magazine Capacity: 17 Round Package Contents: Shield Arms Glock 17 17/rd Handgun Magazine with +5 Extension Black 9mm Luger 22/rd A brand new Glock 17 OEM 17 round 9mm magazine with an anodized Shield Arms +5 magazine extension pre-installed. Their unique easy access floor plate design allows you to quickly access the spring and follower without having to remove the extension from the magazine body. Comes with a 100percent lifetime warranty and the Shield Arms Spring for Lifeguarantee.Disclaimer Use of this extension with the Glock 19X requires removal of the pistol's lanyard loop. QSG17ME5INSBLK