Switch from .223/5.56 to 9mm easily with the MEAN Arms® ExoMag Ejectorless AR-15 9mm 32-Round Magazine. This magazine is compatible with MEAN Arm's Bearing Delay and CMMG Radial Delay rifle systems and features lightweight polymer construction for a durable build. Plus, a polymer follower ensures smooth reliable feeding, and this magazine can shoot all 9mm ammo including hollow points. The ExoMag features a last round bolt-hold open feature so your rifle functions like normal. Even better, this magazine is backed by a lifetime warranty Specifications Material: Polymer Color: Black