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CMMG Mk4 / AR15 4.6X30mm 10rd Magazine.
With 10-round capacity, this magazine uses the same profile and size as the 40rd FourSix magazines and has similar exterior dimensions to most 30rd 5.56mm AR15 magazines. Designed to seat into a standard AR15-sized magwell to feed the CMMG FourSix upper receiver along with a CMMG Mk4 (or other AR15) lower group of your choice.
Designed exclusively to feed the 4.6x30mm cartridge.
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