Look at gunparts.com or Numrich arms
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
My Glenfield Model 25 has a micro-groove barrel,so I imagine others do as well.
The Marlin Model 783, which features a Micro-Groove barrel, was produced exclusively from 1971 to 1980. This model was specifically designed for the .22 WMR (Winchester Magnum Rimfire) cartridge. After 1980, Marlin discontinued the production of the Model 783.
I have seen them sell for between 400-500 dollars depending on condition and a good bore.
No
Numrich gun parts Item #418800 D Key #28 $18.45 + shipping
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.
50-200 USD
200.00
200.00
You will need to add the serial number,to get the answer to your question.