The CMMG MkGs barrel and bolt carrier group kit converts an AR-platform rifle to 9mm using CMMG's Radial Delayed Blowback system. It pairs a 16.1-inch medium-taper barrel with the matching radial delayed bolt. Both are 4140 chrome moly with salt bath nitride inside and out. The kit requires an enlarged ejection port for reliable operation.
- Fits: AR-platform rifles
- Caliber: 9mm (9x19 NATO chamber)
- Barrel: 16.1 in, medium taper, 1:10 twist
- Muzzle thread: 1/2-28
- Material: 4140 chrome moly
- Finish: Salt bath nitride
- Includes: barrel and radial delayed blowback BCG
- Kit weight: about 2.5 lb
- MPN: 99DE642
