The TriggerTech AR15 Single-Stage drop-in AR trigger provides a true zero-creep break extremely short overtravel a sub 0.030" tactical reset and offers outstanding reliability even in the harshest environments. Pull weight of 3.5 lbs Available with flat or pro curved trigger lever Zero Creep Technology along with hardened 440C stainless steel internal components ensure corrosion resistance and an extended service life. As Zero Creep Technology does not rely on coating polishing or lubricating the key engagement surfaces trigger pulls will be more consistent from shot to shot and after thousands of shots than you ever thought possible.All pull weights and measurements are approximate.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 we strongly suggest you retain the services of a competent professional gunsmith to install your trigger and perform all important safety checks.