I recently bought a 10 in. 32 cal barrel, like Hammerdown's, bottom was milled flat [seen somewhere could do it so would fit 3rd model?]. The top rail is marked Model of 91, but doesn't have the Maltese Cross on each side of lettering like my 1st model does. Caliber is stamped like the 1st model but is lighter stamp & not as good a job, like it became a factory second or something, also has no serial number. No doubt sold as extra barrel.