[John@JCDLESales]

Everyone above offered very sound advice but one thing was overlooked. You will have to Torque your Barrel Nut 3 Times unloosening the first two times and if need be overtorqing on the third time to line up for the Gas Tube. BUT you will want to coat the threads on the Receiver and the threads of the Barrel Nut with a Good Quality Never-Seize first. You have two different metals here the Alloy Receiver and the Steel Barrel Nut. Without the application of the Never-Seize you wil get electrolisis and this is to be avoided. Find below a Pic of a Jar of Never-Seize I have had for 20+ years and it will be half full when I'm gone. A Very Little Goes A Long Way but you need this for proper AR Barrel Installation. I also use it when reinserting AK Barrels