My father in law was given an old Remington model 1894 single shot 12ga by his uncle. Said his uncle told him it shot 2 1/2" shells which I had never heard of but found them online. He's not attached to it and looking to get rid of it and wondering what it's worth. I haven't seen it other than these pics but he said it's definitely been used. Asked him to look down the bore and he said it looked clean and no rust. If what I found online is correct it says they were made between 1894-1910. Anybody know about this one and venture a guess on value?