CMMG Mk4/AR15 5.56mm 30 Round Rifle Magazine Black. 56mm magazine stands up to the elements with its advanced polymer construction and makes use of its uniquely CMMG style to enhance grip traction in adverse conditions. The red anti-tilt follower provides a positive visual indicator when your mag runs dry and ensures smooth feeding. Raised dot stippling and 360 re-enforcement bands guarantee you've got a grip when swapping magazines. Specifications for CMMG Mk4/AR15 5.56mm 30 Round Rifle Magazine: Manufacturer: CMMG Finish: Black Magazine Capacity: 30 Round Caliber: 5.56x45mm NATO Gun Make: CMMG AR Platform Gun Model: CMMG Mk4 AR-15 Gun Type: Rifle Package Contents: CMMG Mk4/AR15 5.56mm 30 Round Rifle Magazine What firearm models does the manufacturer say CMMG Mk4/AR15 5.56mm 30 Round Rifle Magazine is compatible with? The manufacturer suggests that CMMG Mk4/AR15 5.56mm 30 Round Rifle Magazine is compatible with AR-15 CMMG Mk4CMMG 55AFC5B: Mk4/AR15 5.56mm 30 Round Rifle Magazine Black