Promag AR-15 Rollermag .223 Rem, 5.56 NATO 40-Round Magazine

This is a ProMag® RollerMag 40-round extended magazine for AR-15 rifles in 5.56mm/.223 Rem.
ProMag’s 40-round RollerMag AR-15 magazines deliver next-gen performance and lightweight practicality at a price that’s hard to beat. Built from durable Technopolymer with ProMag’s special Roller Follower and anti-fatigue chrome silicon springs, these RollerMag magazines are designed to be loaded and stored for up to six years while still delivering ultra-reliable feeding and performance every time you pull the trigger. Providing the ultimate in flexibility, customizability, and reliability, the AR-15 platform is a perfect addition to any shooter’s arsenal. Customize and modify your rifle to your heart’s content—and ProMag magazines are there to keep it all running smoothly.