Thanks William . It is from just taking the barrel on and off - and I will see if I can get my Lad to take a pix . There was a time when this sort of thing would have me pretty upset , but I am older and wiser now . It's just a gun , and in due time I will get the burr squared away and see to it Mossberg replaces the tube .
I sure am happy with the Spacer Tube you sent me ..., keep up the fine work !