EZEARL - thanks for your response. No, I missed that link that gave me what to look for on the barrel. Left side is marked "FY E 1 (or I) 3 * space 6 D X 96". If I read the listing correctly my M600 was manufactured in "D-Sept"; "X-1973" which agree's with when I purchased it in early 1974. Right side of barrel numbers/letters matches exactly with the diagram. Appreciate your input and sactollers listing. Regards, Homesteader.
