I installed a Volquartsen sear in my Ruger Mark II a couple of weeks ago. I noticed a difference in the feel immediately. Prior to the conversion I couldn't tell any difference between the trigger on my Mark II or my son's Mark 1. After installing the new sear, the trigger pull was lighter and more crisp. However I wasn't able to get out to the range to see what effect it had on accuracy until yesterday. I am very pleased the results. This is a 20 shot group fired at 21 feet range, off hand (no rest) with iron sights. I'm happy with that. I highly recommend the Volquartsen sear for a very cost effective upgrade to the Ruger Mark II pistol accuracy. The one I installed was a "bargain-bin" parts for $12. Very worth the money. https://www.volquartsen.com/products/872-mkiimkiii-target-sear-bargain-bin - Edit - When I mention iron sights that includes my 51 year old lousy eyeballs too.