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With shims it’ll be a trial and error process to get the right amount and thickness of shims. Just keep test fitting till you get there. Of course that’s if you’re using a flash hider that needs to be timed. Usually a true flash hider (only) won’t need timed. Whereas a brake or combo unit will. Any idea what you’re using at this point?

As for taking the old one off you shouldn’t need too much force to remove it. Clean the threads off real well and use a small (I stress small) amount of Rocksett to hold the new muzzle device in place.