I was about to perform the " Shim" fix on my rimfire savage striker. I took the trigger group out. I stoned the sear face and lever contact surfaces, then I started looking at the engagement spring.

I had a AR15 LPG kit in my smithing tackle box, and realized the bolt catch spring was the same diamiter but shorter.

I put it in. Took the travel take up screw all the way down to the keeper bolt, and reassembled.

Perfect 3.2 lb trigger with no shim.

Try it.