KCI USA is a well known importer of South Korean Manufactured firearm magazines. These magazines are known for their high quality and reliability. They are made from durable materials including metal and polymer. At The Mag Shack we carry a wide assortment of KCI USA magazines. These included many extended magazines made from quality components similar to the original factory manufactured magazines with your firearm. We have options for your AR-15, Glock pattern firearms, AK-47 rifles and others. All of these come at very competitive prices and unmatched service when you order from The Mag Shack. KCI USA also offers a limited lifetime warranty on all their magazines.