Duramag Speed AR-15 Rifle Magazine 5.56/.300BLK 20 Round Gray 1 Pack Aluminum 20RD. 56 magazine for AR-15 w/orange follower. Specifications for Duramag Speed AR-15 5.56/.300BLK 20 Round Rifle Magazine: Manufacturer: Duramag Fabric/Material: Aluminum Magazine Capacity: 20 Round Caliber: 5.56x45mm NATO .300 AAC Blackout Gun Make: AR Platform Gun Model: AR-15 Quantity: 1 Condition: New Package Contents: Duramag Speed AR-15 5.56/.300BLK 20 Round Rifle Magazine What firearm models does the manufacturer say Duramag Speed AR-15 5.56/.300BLK 20 Round Rifle Magazine is compatible with? The manufacturer suggests that Duramag Speed AR-15 5.56/.300BLK 20 Round Rifle Magazine is compatible with AR-15Duramag 2023002178CPD-20RD: Speed AR-15 Rifle Magazine 5.56/.300BLK 20 Round Gray 1 Pack Aluminum