I recently purchased a Volquartsen trigger kit for my Ruger mark IV. After installing it I went to the range to try it out. Right from the start I was getting so many misfires I was sure I installed the kit wrong. I called Volquartsen for some tech help and they said it was probably the original firing pin.They sent me a new Volquartsen firing pin and that was it.I put 80 rounds thru it today and not one misfire.