SIG SAUER Factory Replacement Two Stage Flat Blade Trigger Kit for M400 TREAD Black. This trigger is a significant upgrade over any mil-spec trigger and is compatible with any mil-spec lowe. This Two Stage Match Flat Blade Trigger reduces the weight of the pull to break crisp and clean at approximately 5lbs. This Premium trigger is optimized to enhance any M4 / AR-15 M400 MCX 516 Specifications for SIG SAUER Factory Replacement Two Stage Flat Blade Trigger Kit for M400 TREAD: Manufacturer: SIG SAUER Color: Black Finish: Black Features of SIG SAUER Factory Replacement Two Stage Flat Blade Trigger Kit for M400 TREAD TRIGGER KIT M400 TREAD TWO-STAGE MATCH FLAT BLADE BLK Package Contents: SIG SAUER Factory Replacement Two Stage Flat Blade Trigger Kit for M400 TREAD SIG SAUER Infinite Guarantee SIG SAUER 8900696: Factory Replacement Two Stage Flat Blade Trigger Kit for M400 TREAD Black