FYI md10/22,
I put John McCaw's spring set in a slab side SS Target Mdl Mark II. Reworked the stock hammer/sear, used Sumshooter's disconnector trick, and got a short take up sub 2 lb trigger. This pistol was purpose built for Rimfire Steel Challenge. For once, only had to reassemble the bolt stop assy one time (danged ball bearing)! Wonder if Gunsmither has a tool for that?