4.5lb. non-adjustable combat trigger; Trigger and hammer are made from quality tool steel; A full force hammer spring is used for quick locktime and positive ignition of all types of ammo; The lightened hammer favorably decreases locktime and increases accuracy of the weapon, especially for snap shots; Simple design that is very similar to the original M16 trigger; No adjustment screws to come loose; Can be installed without removing the safety; Comes with a slave pin for the trigger/disconnector assembly for easy installation; Patented pseudo sear that is almost identical to the standard AR15 single stage sear; Designed to operate in dusty, abrasive environments that cause wear