The Marlin lever action rifles have a plunger on the finger lever which helps lock the lever closed. Cycling the action needs to overcome the plunger spring in order to close the action when chambering a round.

Reducing the power of the plunger spring along with polishing the plunger and mating surface can make it easier to close the lever. In conjunction with a reduced power mainspring it can make the cycling of the action substantially smoother and increase the speed of follow up shots.

This will improve your rifle for lever action match events or for getting in among a mob of pigs or goats where smooth action and rapid repeat shots are vital.