CMMG Mk9 AR-15 4.6x30mm 10 Round Magazine

The FourSix 10rd magazine seats into a standard AR15-sized magwell and feeds the CMMG FourSix upper, paired with a CMMG Mk4 or other AR15 lower group. It has the same profile and size as CMMG's 40rd FourSix magazines, and its exterior is similar to a 30rd 5.56 AR15 mag. It is made only for the 4.6x30mm cartridge. Patent pending, Lifetime Quality Guarantee.