Took it 2 dixons a few years ago & they changed the lock out under warranty he said trigger & lock good enough 4 hunting?? i dot like they longer delay in it now was looking maybe 2 upgrade 2 a Siller or other??
You are in for a lot of inletting, if it will even work to put a Siler in your Lyman.
If you want a better lock, this is your least intrusive option. Might be some minor fitting, mostly depth vs. shape. I have read on here guys needed to cut a bit deeper for the screw heads on the lock. L&R Lyman RPL Lock
“There is Truth in the Old Saying, That if you make yourself a Sheep, the Wolves will eat you.”
Benjamin Franklin, 1773
My Lyman Deerstalker has a very good lock on it and I wouldn't change anything about it. L&R does make a replacement non-coil spring lock but the pan won't be the wide flat style that I like. It would probably not require a great deal of inletting to get it to fit.
What exactly are you unhappy about with the stock Lyman lock. I know locks pretty well and can tune them if needed but in my case the stock Lyman lock has been a winner on my rifle. Hasn't failed to fire yet; ever, and it's pretty fast. The L&R replacement does have a shorter hammer throw so it will be a little faster but not enough that you or I would ever notice it.
The trigger on mine is as light as I would ever want it but the lock design is very similar to a TC lock only a little better IMO.
Take it out of the stock and try it then put it in again and see if it's binding anywhere in the mortise. Look at how it works; if you push up on the sear arm it compresses a spring and if that's binding it will be rough. Maybe try lubing that spring to see if that helps. While it out of the stock check to see if the trigger moves freely. You can try pushing that spring up a little manually to see how much tension is in the lock internals. Make sure the cover screw aren't too tight and binding that stuff up and make sure it's cleaned and oiled every time you shoot it. Sometimes things need a little attention. I had to do a good bit of tinkering with my TC PA Hunters but the Lyman came out of the box going strong.
The design of these locks when coupled with a single trigger is that it's the spring compression is what controls the lightness of trigger pull.