To be safe take to gunsmith. To be me....
I polished the mating surfaces (all metal to metal contact) with 2000 grit sandpaper until it had a slick shine. HAND polish to prevent taking off too much metal. Then I cut squares out of a soda can and punched a hole with a hole puncher. I used these as shims. To be safe (er, safer) I only used one shim but could've done more.
My trigger is better than it was, but it's a Mosin, still had that spongy trigger feel.
Of you're not a purist, they do make aftermarket trigger assemblies, but I have no first hand experience there.
"If you remember nothing else about what Iím about to consider here, remember this: the one and only reason politicians, bureaucrats, and policemen want to take your weapons away from you is so that they can do things to you that they couldnít do if you still had your weapons."ó L. Neil Smith