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. Comes with a 100% lifetime warranty and the Shield Arms Spring for Life guarantee. - 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 - Lifetime warranty