All the later hammers from Marlin that are undercut for hammer spurs are wider and will not fit your gun. There used to be companies that made spurs specifically for those old Marlins with the narrow hammers and no undercuts but I think that's mostly an Ebay item now. I personally don't like hammer spurs as they slow down lock time and have even been known to cause weak primer strikes. I don't slam my scopes down low on Marlins so I'm not forced to use a spur. If yours is a 1957 the serial number will begin with the letter P.
Last edited by moosemike; 12/22/16.
