I recently purchased a used M&P 45. I picked it up as the trigger pull was fantastic. I assumed the previous owner had installed an Apex sear. I didn’t notice that the coil spring for the locking block was partially broken until I got the gun home. I contacted S&W a week ago and was told a pin would be put in the mail. Still no pin. Any suggestions on where to find one. Ebay and brownells do not have the 45pin in stock.