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My .204 project is finally finished. I have a BC that I sent in the reciever in and had a .203 barrel fitted to. It became awkward to change barrels, and like so many others decided to buy a reciever and fit the barrel to it. The barrel finally fit the used reciever with the shimming directions from Quick to do's site. I also had to shim the spacer. Now it shoots a 39 grain Sierra to about 1". It shot better before, but that is history. I am ok with the accuracy, as it is minute of coyote.I had a few light hits which I have never had before, and I suspected that the firing pin was the culpert.Being a used reciever, I don't know what the history is and what to do about it.I had the reciever open today looking closley at it, and the pin stuck and wouldn't retrieve. I pushed it back with a screw driver. It also would come out a short distance, but also would come out 2x the distance.So I looked the FAQ's over and found nothing on firing pins.