Affords quick, efficient reload with second magazine. Design features a Top Round Protector to prevent the top round from being dislodged forward in the extra magazine due to firing of the weapon. Ensures proper staggering by utilizing fixed standoff points molded into the carrier to prevent the magazines from moving relative to each other. Constructed of a sturdy molded nylon case with three bolt through connectors to insure that the magazines are locked in place, even after repeated aggressive loadings or dropping of the magazines to the ground. Fits AR15-style, 30 round magazines.