Try the Gunbloke Australia he sells spring kits for most guns I've bought a items from him over the years, shipping is faster than US can be found on Ebay or direct from his website
I put a rifle basix kit in my Savage 223. I dropped the trigger pul to about 2-2.5 lbs. works great and with handloads it does .3 inch 5 round groups at a 100. It made a difference as the trigger on the Stevens 200 wasn’t the best.
Has anyone with a Timney or Riflebasix trigger shot an MCarbo trigger kit? I know the timney and riflebasix are superb, wondering if the mcarbo is any good; or is it just a minor improvement on the soggy crap-sandwich that is a factory axis trigger?