Drop in trigger for Browning A Bolt

[w296]

I have a friend that would like to improve the trigger pull on his A bolt. I've looked in Brownells for a Timney or Rifle Basix drop in trigger but they don't list any.Or, at least I can't locate a drop in for it. They do list a spring kit for the bolt though. ?? Any thoughts would be appreciated. :banghead:

Thanks

Ron