Probably overthinking this but I've got a dead air xeno mount for my supressor but I've never messed with muzzle devices before. I torqued it down and have a little gap between the barrel shoulder and flash hider. It looks concentric but it that gap normal? A friend said I should get shims.
I can post a pic of the barrel threads but there's a short unthreaded section at the base tha I guess is causing this. The flash hider threads are longer than the barrel's so it isn't bottoming out.