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.