My old Mark IV 22/45 with upgrades is ready for Rimfire Pistol Iron division at Steel Challenge.
Volquartsen Accurizing Kit and Bolt, Carolina Crusher Compensator, Green Fiber Optic Front Sight, Bill Stripline Cornerstone Safety and Thumb Rest, StonerCNC.Com Grips. It's favorite ammo is CCI Blazer 40 grainers. I have 15 magazines from Ruger and all work fine.