I just installed the Volquartsen hammer and sear in my 6 7/8" slab side bull barrel competition model Mark II. I didn't think it was too hard. It reduced the trigger pull by around 20 ounces. I had also purchased the main and hammer bounce spring kit (I got everything in the "accurizing kit" but the trigger). I haven't yet installed the main spring. I'm not sure which pin you would have to remove to install it. Since you'ld have to drill out the pin, and you only get one replacement with the spring, I wasn't in a hurry to try it. It works fine with the original spring. I recommend the hammer and sear. Good luck.
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