Dependable & Nearly Indestructible; Store Fully Loaded Without Loss Of Reliability Exceptionally rugged, combat- and competition-ready magazine functions flawlessly, even when left fully loaded for extended periods. Corrosion-proof, self-lubricating one-piece body of fiber-reinforced, molded polymer has no spot welds or joints to impair the follower, and the constant internal curve ensures smooth, unobstructed movement of the round stack. Anti-tilt follower stabilizes the stack to help prevent nose-diving and bolt-over-head failures. Heat-treated, stainless steel spring is stress-relieved for optimal performance. Included quick-release magazine cover seals out dirt and alleviates feed lip deformation caused by pressure from a full ammo stack during long-term storage. Withstands the heat from prolonged full-auto fire and is not harmed by most bore cleaners and solvents. Exterior ribbing provides added gripping surface; magazine catch notch, rather than a traditional hole, keeps dirt and debris out. Easy-to-grasp ledge on floorplate aids in extracting magazine from pouches; floorplate removes easily for cleaning.