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 100% 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. Features: Unique easy access floor plate design to service or clean the magazine body without the need to remove the magazine extension from the magazine body. Index cuts on the extension body to increase grip when coming out of a magazine pouch. Machined from billet 6061 aluminum Type 2 anodized Adds 5 rounds to Glock 17 9mm Comes with a +10% power spring Fits OEM Glock magazines only Proudly made in the USA Fits most aftermarket flared mag wells Lifetime warranty