Drop-in trigger module fits any mil-spec small-pin AR-15 and delivers a light, superbly crisp trigger pull right from the box, with no adjustment or fine-tuning. Crisp, 4-lb. pull is safe enough for tactical operations and combat, yet light enough to ensure an ultra-clean break that?s closer to a bolt action than a typical tactical rifle. Exceptionally short, positive reset gets you back on target and ready to take the next shot almost instantly. Unique hammer geometry keeps weight to a minimum for ultra-fast lock time, yet provides plenty of kick to ensure reliable ignition, even on hard military primers. A secondary ?rescue? sear grabs the hammer if the primary sear fails when the weapon is dropped or severely jarred?meets military specifications for drop safety. CNC-machined, hardened tool steel hammer, sear, and trigger body with precision-ground contact surfaces are built to run hard in competition or combat, all contained in the rugged machined aluminum housing. TR-TTU - Single-stage pull has zero take-up and an ultra-clean break