7.62x51mm / .308 Winchester caliber; AR10, M110, SR25 platform; 20-round reliability; Next-generation impact and crush-resistant polymer construction with a high-quality stainless steel spring for corrosion resistance; Anti-tilt, self-lubricating follower and constant-curve internal geometry ensure smooth feeding; Anti-glare translucent MagLevel windows on both sides of the body and painted indicator on the spring allow for easy determination of rounds remaining; Enhanced Ergonomics - Weighs less than standard-issue steel magazines; Ribbed gripping surface and aggressive front and rear texture for positive magazine handling; Flared floorplate aids extraction and handling while providing improved drop protection and better compatibility with tight double magazine pouches; A paint pen dot matrix at the bottom panel of the body allows easy marking for identification; Made in the USA