CMMG Mk17 Armor Black Lower Receiver Assembly (92CA245-AB)

Accepting Sig Sauer M17/P320 magazines, the CMMG Mk17 Lower Receiver Assembly delivers a new level of performance to the PCC world. Not only is it on an elite playing field in terms of fit and function, the Mk17 brings out all the features you've come to expect from CMMG, including Last Round Bolt Hold Open. Designed to operate exclusively with CMMG's Radial Delayed Blowback upper, or build using their Barrel and Bolt combo.