This next-generation 5.56x45 NATO (.223 Remington) polymer magazine for AR-15/M4-compatible weapons incorporates new material technology and manufacturing processes. Its enhanced strength, durability and reliability exceed rigorous military performance specifications. Modified internal and external geometry also permits operation with a wide range of non-Colt-spec. platforms. A redesigned bolt-catch notch in the rear of the magazine provides increased bolt-catch clearance, while an over-travel stop on the spine helps ensure the magazine will not over-insert on compatible weapons. Features include a long-life USGI-spec. stainless steel spring for commonality, four-way antitilt follower and constant-curve internal geometry for reliable feeding, and simple tool-less disassembly for cleaning. Low-profile ribs and aggressive front and rear texture gives positive control in all environments. A paint-pen dot matrix on the bottom panel of the body allows easy marking for identification. The easy-to-disassemble, flared floorplate aids extraction and handling while providing improved drop protection. Made in USA. Available: 10-round, 20-round, 30-round, 40-round capacities.