BRAND NEW X33 for use in HK 53 rifles, you asked for it so here it is. The X33 is engineered around our proven coil magazine technology which allows side by side staging of ammunition in a single stack. Due to our patented tension relief device, the X33 can operate for an almost unlimited number of spring loads and can even perform in weapons with capabilities of up to 1100 rounds per minute. The streamlined design allows for zero separation of the ammunition during operation which prevents malfunctions and allows for an exceptionally compact profile. The X33 is about two inches shorter than a standard 30 round magazine. Manufactured of the highest grade materials which give it unparalleled reliability and strength. The critical components of the mechanism are coated in Cerakote for friction reduction and proven reliability without the need for lubrication.