(1): don't use JB weld for that job. (2) you did not say what the replacement stock is made of, wood or synthetic. (3) do not bother with 'glass bedding' kits at $40 per, get some bedding compound from Brownells - less than $10 - the kind that comes in two tubes and you mix the amount you want (works with all materials). (4) you can pillar bed the rear action screw if you want and can use pretty much anything you want - copper, aluminum. (5) Bed the entire action and the barrel no further out than the end of the chamber. (6) Do not forget to use a release agent or you 'project' will be 'permanently fixed'.
If you are replacing with a mil-spec stock, make certain the barrel is free-floated all the way out and also make certain when you re-mount the upper handguard that it sits on the lower stock, not the barrel. I have floated a couple of mil-spec rifle barrels like that - literally free floated them within the military stocks, and they have all shot great. Hope this helps.
