I'm not a machinist or a gunsmith, but I am interested in building a custom AR. What kind of work needs to be done when mating an upper receiver assembly with a custom barrel? Is it work that anyone can do or is it reserved for an experienced gunsmith? I am assuming you already have the receiver set, BCG and a chambered barrel.
Bolt it on and torque to spec. If you are really wanting the best out of it, have the receiver extension trued.
