Mean Arms Ejectorless ExoMag AR-15 20 Round Rifle Magazine Black 1 Pack Black. Injection-molded polymer construction offers exceptional durability and natural corrosion resistance while the high-tensile steel spring and polymer follower work together to deliver consistent operation under stress. Better yet this magazine comes equipped with a last round hold-open feature. No magwell adapter or tools required. Compatible with all 9mm ammunition including hollow points. Specifications for Mean Arms Ejectorless ExoMag AR-15 20 Round Rifle Magazine: Manufacturer: Mean Arms Color: Black Fabric/Material: Polymer Magazine Capacity: 20 Round Caliber: 9mm Luger Gun Make: AR Platform Gun Model: AR-15 Injection-molded polymer construction Durable steel spring Injection-molded polymer follower Ejectorless design Works with bearing delay or CMMG radial delay systems Compatible with STANAG-pattern lower receivers Last round hold-open feature Package Contents: Mean Arms Ejectorless ExoMag AR-15 20 Round Rifle Magazine What firearm models does the manufacturer say Mean Arms Ejectorless ExoMag AR-15 20 Round Rifle Magazine is compatible with? The manufacturer suggests that Mean Arms Ejectorless ExoMag AR-15 20 Round Rifle Magazine is compatible with AR-15Featuring an ejectorless design the MEAN Arms ExoMag Ejectorless AR-15 Magazine is designed to deliver smooth and reliable operation with the MEAN Arms bearing delay or CMMG radial delay systems. Injection-molded polymer construction offers exceptional durability and natural corrosion resistance while the high-tensile steel spring and polymer follower work together to deliver consistent operation under stress. Better yet this magazine comes equipped with a last round hold-open feature. No magwell adapter or tools required. Compatible with all 9mm ammunition including hollow points.