Pull weight of about 3.5 lbs; The pull weights and sear engagement are non adjustable by the shooter; 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; Simple design that is very similar to the original M16 trigger; All springs are captive; The entire trigger can be dissembled for cleaning (no rivets or staked parts); The trigger can be installed without removing the safety; Comes with a slave pin for the trigger/disconnector assembly for easy installation; Ideal for use in precision Squad Designated Marksman type rifles where weapon accuracy and reliability are critical and a non-adjustable drop in trigger is desired