ProMag RollerMag AR-15 Magazine 223 Remington, 5.56x45mm, 300 AAC Blackout 40-Round Polymer Black

ProMag's 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 ProMag's anti-fatigue chrome silicon springs - so you can keep them loaded and stashed for up to 6 years without worry.FeaturesTechnapolymer constructionRollerfollowerChrome Silicon springs