1. Marlin Owners Forum...
2. google Happy Trigger
All depends on the trigger. Some Marlon triggers are hardened steel. Some are surface hard. Stone and polish the surface hard off and down the road you have a mess.https://www.brownells.com/rifle-par...ng-kit-for-marlin-lever-action-prod20641.aspx
Just a few spring changes will make a difference and you can find some information on the marlin Owners Forum about doing a little polishing to smooth and lighten the trigger.
I have heard good things about the happy trigger but I got mine and a friends 45-70 pretty dang good for a couple of bucks and a little work!
I ordered a lighter hammer spring from Wolf Gun springs that made a difference. You do have to be careful that you don't go to light and get light hammer strikes.Any suggestions on how to improve the trigger to make it a lighter poundage,thanks