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450 SMC from DoubleTap ammunition

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CMMG MkG Guard Takes On the .45 ACP Magnum?

CMMG’s MkG Guard is an AR-15 rifle that is chambered in .45 ACP and feeds from factory Glock magazines. At the heart of the Guard is the patent pending Radial Delayed Blowback operating system that works to harness the strong recoil impulse of .45 ACP. After extensive durability testing, CMMG is proud to announce that the Guard is safely rated for 450 SMC.