Your semiautomatic firearm is only as reliable as the magazine feeding it. These new 30-round magazines are a component of the Tapco Intrafuse AR Rifle System, and they can be depended on everywhere from the local shooting range to deployment overseas. Aggressive horizontal ridges on these magazines let you get a sure hold for insertion or extraction – even in wet and muddy conditions. Constructed of rugged, reinforced composite polymer material, you'll find them to be reliable in any environment. Manufacturer's lifetime warranty. Made in USA.