I would like to replace the barrel on my Ithaca Model 37, will any Model 37 barrel fit my shotgun?
No, because there is a difference between old style and new style barrels for the Ithaca Model 37. The new style barrel threads go to the end of the barrel, and on the old style barrels the threads will stop short of the receiver end. The easiest way to tell which style barrel you need is to check your serial number. The old style shotguns end with serial number 855,000 and any number higher than that is the new style. This applies to all variations, including Ithaca Deerslayer models.