The Geissele SSA arrived from ArmsEast and today put it on the Norc M4. Installation is pretty straight forward with the instructions and a how to video on youtube helped. the outdoor ranges around here "do not" encourage rapid strings of fire, especially on a rifle. so off i go to an indoor range that only allows frangible .223 ammo. it was worth the $ spent both on the ammo and the trigger. the reset was short and the second stage trigger pull was around 3-4 lbs. rapid strings of fire was only limited by how fast i can pull the trigger. the two stage trigger is good for me as I shoot 3 gun action shooting and will eliminate AD's when prepping for the shot. it was expensive but i feel worth it. i also replaced the grip with an ERGO. what a difference as the factory norc grip hurt my hand during prolonged firearm handling.