PaJak is right, concerning Marlin triggers. But, the trigger on Marlin lever actions is a straightforward engagement between the trigger nose and the hammer notch, so engagement depth can be reduced and the notch and nose can both be polished enough to make the trigger crisper. Just make sure you DON'T CHANGE THE ENGAGEMENT ANGLE BETWEEN THESE TWO PARTS!! There is no aftermarket replacement trigger for these rifles.

Keep yore powder dry!!