If you don't mind sharing, what are some things that can be done to make the trigger more smooth?
Morning Rambo101
I hate to give specific trigger altering advice to others as I am not a certified gun smith. I have worked on guns & gun triggers for the better part of 40 years but only on my own guns.
Without being too specific-- on my personal 15-22 I stoned the trigger sear top & forward edge to a smooth ripple free surface then used a Dremel to highly polish the contact surface.
On the hammer I lightly stoned the sear engagement notch & squared the outer edge to be straight & square. Then polished the engagement surface to a mirror shine.
I then made a slightly larger hammer pin (.1555") as the original (miked at .1535") allowed some slight hammer twisting & pin movement in the receiver.
Then I assembled & used a rubber hammer stop to prevent the hammer from harshly contacting the receiver then dry fired the hammer about 1000 times.
Then disassembled the trigger & hammer & re-polished the areas that showed scuffing from the dry firing.
This left me with a very smooth but long trigger pull so next I slightly re-bent the trigger spring & slightly re-bent the hammer spring (still well above the JP Enterprises yellow spring set though).
This yielded a very smooth 4.5 lb trigger with a clean crisp let off (but still quite long on the travel)
So next I added a set screw to limit trigger sear engagement (this is MY PERSONAL choice so I won't elaborate on what I did as this only brings on controversy). I will only say the trigger did, always has, & does now (always) pass the trigger group safety tests.