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 our tens of thousands of satisfied customers.Features:Single Stage Trigger3.5lb pull weightSmall pinUltra-crisp trigger with no feel of creep prior to hammer releaseThe trigger has a glass-smooth break with no feel of grittinessMinimal lock time is designed into the assembly using controlled hammer weight and balance activated by a rocket wire hammer spring, assuring repeatable function with either commercial or military grade ammunitionTrigger pull is factory pre-set and not user adjustablePositive trigger reset allows a quick follow up shot on targetHand assembled, and hand testedTotally self-contained one-piece assemblyComes with CMC Anti-Walk Pin SetFits MIL-SPEC AR-15 and AR-10 style riflesMade from 8620 Alloy Steel and S7 Tool Steel with machined tolerances of +/- .001a ^2Easy to install