ProMag AR-15 Roller Follower 5.56mm 40-Round Black Polymer Rifle Magazine

RM-30 – The ProMag 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.