Uncompromised quality, performance and the durability to last a lifetime. The X-10 is a .308 caliber 50 round drum built of the highest grade materials to give it unparalleled function and rigidity. Engineered using our proven coil magazine technology, which allows side by side staging of ammo in a single stack. The streamlined design allows for no separation of ammunition during function, preventing malfunctions and lending to it’s compact design. Our patent pending tension relief device allows the X-10 to operate nearly unlimited spring loads, allowing it to function in weapons with capabilities 850 rounds per minute. Magazine easily loads and unloads by operating the front operating wheel. Magazine includes a lifetime warranty and instruction manual. Fits all Armalite AR-10 B guns that use the proprietary AR-10 magazine.