The Shield Arms Glock 17/22/34/35/19X/45 Magazine Extension adds 5 rounds to your Glock 17/19X/34/45 magazine, and 4 rounds to your Glock 22/35 magazine. Our unique, easy access floor plate design allows you to easily access the spring and follower without having to remove the extension from the magazine body. 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 17/19X/34/45 9mm Adds 4 rounds to Glock 22/35 40 S&W Comes with a +10% power spring Fits OEM Glock magazines only Proudly made in the USA Fits most aftermarket flared mag wells