Anyone change the bead sight on a 590a1 with a heavy barrel? Mine is chipped and I've been looking for a new one. I called Mossberg and they said their standard brass bead sight fits. But...I read reviews on midway and some people said the threads didn't match. I read reviews for the tru glo bead sight that said people stripped the threads because it stopped 3/4 of the way from parallel and they forced it the rest of the way. Thought, ideas, suggestions? And no, im not switching to ghost rings or a red dot. Oh and the bead sight on mine was parkerized but it looks like Mossberg only sells one in a brass or white finish.