Promag AR-15 Rollermag .223 Rem, 5.56 NATO 30-Round Magazine

This is a ProMag® RollerMag 30-round magazine for AR-15 rifles in 5.56mm/.223 Rem.
ProMag’s Roller Mag 30-round magazine is a revolutionary new magazine design for AR-15 rifles, featuring special Technopolymer construction with a patented ROLLER FOLLOWER and ProMag’s anti-fatigue chrome silicon springs—meaning that the magazine can be safely stored loaded for extended periods of time (up to 6 years according to ProMag), and still deliver reliable on-demand performance whenever you need it. A masterpiece of ergonomics, function, and firepower, the modern AR-15 is a must-have for practically any serious shooter’s arsenal—along with plenty of magazines to keep it fed. ProMag magazines are designed to the highest specifications for maximum reliability with AR-15 rifles.