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

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.