Les Hovencamp of Ithaca, NY, Diamond Gunsmithing can fit the old barrel without the shenanigans employeed by the current Ithaca Gun Co. Les was the former head smith at Ithaca when M37s were made in Ithaca. I found a 1939 20 ga. barrel that he fitted to a mid to late 1960's gun without alteration or re-bluing of the guns action which is the method done by the new company. Gil