CMMG Resolute Mk17 is a semi-automatic centerfire rifle chambered in 9mm. After the US military decided to use the Sig Sauer P320 as the M17 and M18 sidearms, CMMG developed the Mk17 platform as an alternative way for shooters to feed the 9mm Radial Delayed Blowback Resolute with the same magazines they use in their preferred pistol. The Mk17 is available in CMMG's Resolute series of 16-inch barreled rifles for competitive and casual shooting. Less felt recoil ensured by the Radial Delayed Blowback operating system results in quicker follow-up shots and a more pleasant shooting experience. In order to make pistols and rifles with lighter recoil and lower bolt weight than standard straight blowback systems, CMMG has modified their Radial Delayed Blowback system across their lineups of pistol calibers. This type of system was originally developed for the .45 ACP MkG platform. This rifle also has a 15-inch M-LOK rail system, an efficient muzzle brake, and a lightning-fast CMMG RipStock. Sig P320 mags can be used with this gun. When you combine the Resolute with your old M17 or P320, you have the benefit of magazine switching and the tried-and-true dependability of two powerful brands.