ProMag AR-15 5.56x45mm Rifle Magazine w/Roller Follower 15 Round Black 1 Pack DuPont Zytel Polymer 15RD. It is constructed of DuPont Zytel polymer with anti-tilt roller follower and mag spring formed from chrome silicone wire. Specifications for ProMag AR-15 5.56x45mm 15 Round Rifle Magazine w/Roller Follower: Manufacturer: ProMag Fabric/Material: Polymer Magazine Capacity: 15 Round Caliber: 5.56x45mm NATO Gun Make: AR Platform Gun Model: AR-15 Package Contents: ProMag AR-15 5.56x45mm 15 Round Rifle Magazine w/Roller Follower The ProMag RM15 AR-15 Rollermag 223 Remington/5.56 NATO 15 Rd Polymer Black Finish is a quality addition to the ProMag lineup. For more great deals on AR Rifle Magazines by ProMag please browse our Pro Mag Magazines page. What firearm models does the manufacturer say ProMag AR-15 5.56x45mm 15 Round Rifle Magazine w/Roller Follower is compatible with? The manufacturer says that ProMag AR-15 5.56x45mm 15 Round Rifle Magazine w/Roller Follower is compatible with AR-15ProMag RM-15-15RD: AR-15 5.56x45mm Rifle Magazine w/Roller Follower 15 Round Black 1 Pack DuPont Zytel Polymer