A Marlin MODEL 25 (no "20m" in the designation) can be either a .22 short pump or a .22 lr or .22 magnum bolt action.
A Marlin in .25-20 CALIBER can be either an old or new model '94 lever action or a model 27 pump.
We need lots more information to discuss what you have. A full description is necessary and a good picture will be a help.
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