Z9 +3 MAGAZINE EXTENSION FOR GLOCKA(R) 43 The Shield Arms Magazine Extension adds 3 rounds to your Z9 magazine. Shield Arms 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 Life guarantee. Magazine Extension 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 Mfg: Shield Arms