CMMG’s MkG GUARD in 450 SMC


Boonville, MO–CMMG’s MkG GUARD is an AR15 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.
For those unfamiliar with 450 SMC, Triton first conceived the cartridge in 2001. The design was ultimately taken over and completed by DoubleTap ammunition years later. In essence, it is a magnum version of .45 ACP that offers ballistics that are comparable to 10mm. It is a true “stopper” that delivers energy capable of taking down big game.
While the 450 SMC uses a case with the same outer dimensions as .45 ACP, there are a few significant differences that allow DoubleTap to load 450 SMC with five to six thousand pounds per square inch of pressure more than a standard .45ACP. First, the 450 SMC uses a small magnum rifle primer instead of the large pistol primer. This modification allows the hardened case to be thicker at the base. Second, the brass is manufactured from the ground up to handle up to 30,000 pounds of pressure. The result is a dual-purpose cartridge that is exceptional for both hunting and personal defense. Read more













