>>63925997
Also,
>I am going to build one from the ground up
A completely chrome BCG isn't great. I have one and any oil you put on it finds a way to seep out. Consider something like picrel. Polish the guide rails and you are gtg
Make sure you have all the tools you need. Bench vise, Torque wrench, Wrench for your Castle Nut/Muzzle Device, Punches etc
Red & Blue Loctite; LB 8060 for your barrel nut threads, Green Loctite 620 for the Barrel Extension etc
I recommend Clenzoil for all your CLP needs. There really is nothing better