The Okay Industries Surefeed E2 magazines(now discontinued IIRC)are "enhanced with a patented feed lip design, textured side panels, a new anti-tilt follower, and caliber markings. The E2's patented feed lips reduce the amount of force necessary to strip the cartridge from the magazine, dramatically increasing the reliability when the rifle is dirty or fouled with carbon. As an industry first for metal magazines, the E2 has been enhanced with textured side panels to improve handling in adverse conditions."
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