Any marlin made prior to the move to Elion NY dont have letters in the serial # The GOOD marlins have all numbers in the serial and have a JM rollmark on the barrel ......The BAD marlins have an RM prefix in front of the serial# and dont have a JM rollmark on the barrel
I believe anything after 1953 was micro groove with the exception of some of the BIG BORE rifles
I believe anything after 1953 was micro groove with the exception of some of the BIG BORE rifles
