I just started geting light primer strikes 2 weeks ago after about 1000 rounds. About 2 or 3 a match. I checked my FPB and it was failing as well. I was running a 4th gen Henning pin, LRA extended firing pin block, Titan hammer, EG Extreme light hammer spring, one piece sear,EG extreme light firing pin spring. I put the factory firing pin back in and the FPB is now working. I ordered a EG Extreme firing pin and will install it when it comes in. I'm going to the range this week to test it out.