Following the adoption of the Sig Sauer P320 as the M17 & M18 sidearms for the US military, CMMG created the Mk17 platform as another way to feed the 9mm Radial Delayed Blowback RESOLUTE with the same magazines shooters use in their handgun. Features the EML 15" handguard M-LOK attachment slots are found where expected at the 3, 6 and 9 o'clock positions as well as on top at 12 o'clock. Features ZEROED parts including: pistol grip, drop-in trigger, 60/90 degree ambi safety, muzzle brake, AR15- ambi charging handle, bolt catch and polymer dust cover. Includes Sig Sauer P320 21rd magazine.