The MEAN Arms® ExoMag Ejector AR-15 9mm 32-Round Magazine helps facilitate quick and easy caliber changes from .223/5.56 to 9mm. This magazine can be used with a standard AR lower and all you need is a complete 9mm upper receiver and bolt carrier group (BCG). The ExoMag features a last round bolt-hold open feature so your rifle functions like normal and a built-in ejector designed to perform in any intense conditions. This magazine features lightweight polymer construction for durable strength. Plus, a polymer follower ensures smooth reliable feeding, and this magazine can shoot all 9mm ammo including hollow points. To top it all off, the ExoMag is backed by a lifetime warranty from MEAN Arms so you can get the most out of your range days for years to come. Compatible with standard blowback bolts. Order now!