I have a Winchester 9MM bolt gun, it was my Father-in-Law's gun. Model 36 I believe, I have a half a box of shells as well, they are UMC. The only other 9MM shotgun of us manufacture that I am aware of was an expiremental gun by Stevens in the 30's. I think it was originally built on the "Crackshot" platform, I have only read about them and never have seen one. Interestingly enough the Stevens version was said to be centerfire using brass cases. We know of course that the 9MM we are all used to is rimfire. My wife's grandfather raised vegetables in the '40's and '50's commercially near Forrest City IA, these were stored in underground "mines" the father-in-law tells me that the gun was used to shoot rats and like vermin. It's in pretty sorry shape, but still works. He gave me his only 3 guns when we got married as he hadn't hunted in years, and his son has no interest in guns. I am glad to have them and look forward to passing them on to my children some day.