A line of carbine-length rifles called the CMMG Resolute is available in several calibers. The 9x19mm Parabellum and .40 S&W variations are referred to as MkGs, while the models chambered in .45 ACP are known as MkG. Both have a delayed blowback action invented by CMMG. The CMMG Resolute MkG and MkGs are good examples of lightweight precision AR-15. Lots of parts are interchangeable with standard AR-15 parts. Each Resolute MkG/MkGs rifle is built on a lower receiver that is MkG-forged and compatible with double-stack Glock-pattern magazines. A high-quality steel barrel and a salt bath nitride finish on the barrel provide great accuracy and corrosion resistance. The muzzle is threaded and equipped with a Zeroed muzzle break to minimize recoil and enable easy follow-up shots. To endure the weather better, each rifle also comes standard with a highly resistant Cerakote coating. In addition, a variety of accessories are available, from an ambidextrous charging handle to an ambidextrous magazine release and safety selector for easy use with one hand. The Resolute MkGa and MkGs are among the finest rifles made by a reputable company.