CMC Triggers Drop-In Trigger Kit, Flat Faced Trigger, Black, 4.5lbs 92503 CMC Triggers is the original manufacturer of the Drop-in Trigger Group for the AR-15/10 rifle since 2003. CMC's critical sear engagement surfaces have a proprietary machining process that renders superior surface finish and dimensional control. As compared to their competition" the techniques used to establish a 1-2 RMS surface finish as opposed to EDMing which leaves a pitty 32 RMS" compared to a mirror which is 0 RMS. CMC Triggers Single Stage AR15/10 are available in configurations for Small Pin" Large Pin and M&P 15/22 Trigger in multiple pull weights and Signature Flat" Curved or Combat Curved Bow. Manufactured in the Great State of Texas. CMC's innovative" self-contained and easy-to-install AR-15 trigger groups" have been completely re-tooled to maximize production capacities" incorporate new design enhancements and reduce cost. CMC's AR-15 trigger groups have always yielded exceptional trigger pull dynamics for tens of thousands of satisfied customers.