Ruger dating serial number
They offer a free conversion for the old model single sixes where they install a transfer bar (I think) to prevent it from going off if it is loaded with six and is dropped on the hammer. The 22 WRM chambering was introduced in 59 as 22 WRM only with a bore size of .224".
22 lr only Single Sixes had a .222" bore at that time. As someone else mentioned, it is pre convertable, so it only came with the 22lr cylinder. It has the XR3 grip frame, and the hard rubber grips. The ejector rod housing is steel, as opposed to aluminium on later models.
James Sullivan is not a well-known name in many gun circles. He was one of the driving forces behind the M16, Stoner 63 assault rifles and the Ultimax 100 light machinegun.
One of the other weapons he worked on, and one that shows elements of all of these designs was the Ruger Mini-14.
Marlin Model 336 and Models 39-A and 39-M manufactured from 1948 to 1968: A one or two letter code was used to designate the year of manufacture.
All Marlins (except lever action) manufactured from 1962-1968 A two letter code was used to designate month and year of manufacture.
This number should be used as a point of reference only.(Including Models 1881, 1888, 1889, 1891, 1892, 1893, 1894, 18.) Note that records are chaotic as all models were numbered in a single serial number range, and numbers are often duplicated, and the dates recorded are apparently shipping dates, not dates of manufacture.Brophy studied the records and came up with the following as dates of manufacture.Developed from 1967-1973 with Bill Ruger, the Mini 14 was first put into production in 1974.Now at age 38, it is a classic of firearms lore and has earned a spot among the great firearms of the past century.