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It should be marked on the barrel if it has the Marlin micro groove rifling.The model 25m was made from 1989-2003.That being said it will if it was a early made rifle.
50-150 USD
Marlin switched from Ballard rifling to the newer micro-groove on their 81 DL model in 1954.
My Glenfield Model 25 has a micro-groove barrel,so I imagine others do as well.
The Marlin 1870 is valued at a price close to $600 to $700. The exact will price will depend upon the condition of the rifle.
Micro groove rifling began on the model 39A ,with the 3rd model,3rd variation which was in the year 1954.
Yes the Marlin model 336 in 356Win.caliber has the Micro groove barrel.It should be noted that there were only 1,652 model 336 rifles in this caliber that were ever made.
No
I have seen them sell for between 400-500 dollars depending on condition and a good bore.
Numrich gun parts Item #418800 D Key #28 $18.45 + shipping
1976
The Marlin 890 22LR was made starting in 1954-60. This was Marlins Micro Groove experiment