Shield Arms +5 Magazine Extension for Glock 26, Black G26-ME-5-BLK The Shield Arms Glock 26/27 Magazine Extension adds 5 rounds to your Glock 26 magazine" and 4 rounds to your Glock 27 magazine. The 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.