The TriggerTech Combat AR Primary Trigger is a non-adjustable trigger designed to enhance the accuracy and precision of an AR in demanding roles that require a more forgiving pull weight. Featuring Frictionless Release Technology™, this drop-in AR trigger has a short, two-stage action, that provides a true zero-creep break, extremely short overtravel, a sub 0.030" tactical reset and offers outstanding reliability, even in the harshest environments. Due to there being truly zero creep, most shooters report the pull weights feeling ~0.5lbs lighter than a friction based trigger of the same measured pull weight. The pull weight does not affect hammer force so you can count on dependable primer strikes. As Frictionless Release Technology™ does not rely on coating, polishing or lubricating the key engagement surfaces, trigger pulls will be more consistent from shot to shot. Intended Use: 3 Gun, close quarter engagement, competition, harsh environments operations, home defense, law enforcement, military, precision shooting, rugged hunting, target shooting, varmint huntingTriggerTech Trigger Control DetailsTrigger Lever Type: CurvedTrigger Action: Short Two Stage Action, designed to feel like a 1911Creep: 0.000"Overtravel: < 0.015"Reset: < 0.030"Reset Feel: Tactile mid forceHammer Strike Force: Full1st Stage Weight: 0.75lbs 2nd Stage Weight: 4.25lbsTotal Pull Weight: 5.5lbsPin Size: Standard Mil-Spec Pin (0.154")Weapon Platform: AR 15 Bolt Action RifleHousing: 7075 Annodized AluminumTrigger: 440C Stainless SteelDownload the installation manual here. Note: The installation guide is directed to experienced professional gunsmiths who understand the workings of their AR rifle and know how to fully detail strip the lower receiver. If you do not have these skills, it is strongly suggested that you retain the services of a competent professional gunsmith to install your trigger, and perform all important safety checks. TriggerTech AR15 Combat Curved SS/Blk Two Stage Trigger AR0-TBS-55-NNC