SUPER TRICON TRIGGER- Gives your AR-15 the same high performance and reliability of the SSA trigger with additional upgrades designed for operation in harsh environments. Trigger shoe is curved at the top and then becomes straight, and has pronounced surface texture with raised ribs for positive, non-slip finger contact in wet, muddy, or snowy conditions. Features a 4A 1/2 lb. total pull weight with a 2A 1/2 lb. first stage, plus a full-power hammer spring to ensure positive ignition. Stainless steel springs withstand rough use and resist corrosion in wet environments. Non-adjustable sear engagement. SPECS: Steel, black finish. Fits semi-automatic AR-15/M16 receivers with .154" diameter hammer and trigger pin holes. May be installed on AR-style .308 rifles that accept AR-15 triggers. Kit includes trigger and hammer assemblies, springs, hammer pin, tube of grease and instructions.