ProMag Standard 30rd Detachable w/Roller Follower 5.56x45mm Fits AR-15 Black DuPont Zytel Polymer RM-30

RM-30 - ProMag's new Rollermag reinvents the wheel by adding them to an anti-tilt follower in a Technapolymer magazine body. Experience a smooth anti-tilt rolling feed with the revolutionary ROLLERFOLLOWER for maximum friction reduction. Magazine is built with their ANTI-FATIGUE chrome silicon springs - so you can keep them loaded and stashed for up to 6 years without worry.