Well, I don't do a lot of mag dumps (okay, maybe one or two ), so that's what I was thinking... that I wouldn't be heating the barrel up enough for it to be an issue.Red is only removable with significant heat, so it's "permanent" in that it won't come off unless you really want it off.
Unless you're doing mag dumps or sitting in a SBF position, I wouldn't expect it to heat up enough to fall off. Even if it does heat up, you still have it torqued on there (right?) so it won't just fall off.
As far as torquing it goes, I'll do it as best I can without mangling the knurling on the brake and the jam nut. I know that the red loctite takes quite a bit of heat to remove something that it's been used on. Apparently Century used it to attach the wire side folding stock on the gun. I had to use my propane torch on it to get the screw loose that held it on.