If it has "JM" stamped on the left side of the barrel near the receiver, it is in fact the "Real McCoy".
If it has "REP" in a oval on the right side of the barrel near the receiver, it is Remington Production.
If it has both, then it is a gun that was assembled from parts in the manufacturing chain when Remington bought them.
There are some "Flukes" in the old Marlins as well.......
Some have the "JM" on the right side of the barrel. If you have one of these, they are original Marlin, but stamped incorrectly. They are just a bit rare.
When Remington took over the Marlin Company, they got a lot of partially assembled guns/parts. They also purchased the New Haven name (Logo). So, the only real way to tell what you have is with the proof markings above.
Some folks like to say you can tell by the serial numbers. Well that is not quite true due to the parts that were in the chain when Remington took over. So, if it has the JM (on the left side of the barrel) then it is possible to have a real Marlin parts, assembled by Remington before they started stamping the "REP" on the right. It was a bit confusing during that time.
So, if you have a real Marlin, it was a very lucky find. But just because it says New Haven, CT does not make it a real Marlin made and assembled by Marlin, per the info above.
Only you can look at it now and tell us if you got lucky!
Just the fact that you got it from Academy almost certainly tells me you will find the "REP" on the right side of the barrel.
I would be interested in knowing what you find.
But, the good news is,........if it is a recent Remington Production, you may have a good one after all. I have heard they are getting better lining up the barrels and not messing up the screw heads/wood anymore, but I have not actually seen a recent production one.
In any case, I hope you enjoy the gun. Oh, you are gonna feel a BIG difference going from the .22 to the 45-70! Hold on tight!
