More magazines means less time loading at the range.Introducing the highly durable the ProMag AR15 Rollermag 20 round magazine - Perfect as a spare or replacement.Designed for professional shooters and law enforcement personnel whose lives depend on a perfect shot every time the ProMag AR15 Rollermag is expertly machined for exceptional quality and guaranteed to feed and function for every shot.ProMag magazines include a lifetime guarantee if you ever have a problem with their magazines; simply return them to ProMag for replacement.When you need a cost effective aftermarket replacement mag that you know you can count on you need a ProMag!This magazine is made from Technapolymer with an anti-tilt roller follower for reliable feeding and an anti-fatigue chrome silicon spring for flawless operation that will work even after being preloaded and stored for up to 6 years!FeaturesCaliber: 5.56x45mm NATOCapacity: 20rdFinish: BlackModel: StandardMaterial: DuPont Zytel PolymerType: DetachableModel Fit: AR-15Brand Fit: AR-15 PlatformCapacity: 20Lifetime WarrantyMade in the U.S.A.