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Accepting Sig Sauer M17/P320 magazines, the CMMG Mk17 delivers a new level of performance to the PCC world. Mk17 lowers offer Last Round Bolt Hold Open and are designed to operate exclusively with CMMG 9mm Radial Delayed Blowback uppers, or built with our Barrel and Bolt combo. Mk17 lowers are designed to work with CMMG 9mm Radial Delay Blowback uppers only. Specifications: Platform Mk17, Caliber 9mm, Lower Receiver Forged 7075-T6 Aluminum, Finish Cerakote Standard, Trigger Guard Integrated.
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