A brand new Shield Arms Z9 9 round magazine with an anodized Shield Arms +1 magazine extension pre-installed. Our 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 - Type 2 anodized - 12 coil plus power spring included - Adds 1 round to the Z9 magazine - Fits Shield Arms Z9 magazine only - Proudly made in the USA - Lifetime warranty