The MEAN Arms ExoMag Ejectorless AR-15 9mm 15-Round Magazine is a performance-enhanced AR-15 conversion magazine designed to deliver smooth and reliable operation with the MEAN Arms bearing delay or CMMG radial delay systems. Featuring an ejectorless design, this magazine features injection-molded polymer construction for 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.