7.62x39 goes bang everytime now, except those pesky super hard primers. - HIPERFIRE Hipertouch Enhanced Duty Trigger Heavy Gunner, AR Fire-Control Group

I have a KS-47 now years in the making due to parts missing and finally got to shoot it. It would shoot so had about every 7 or so not fire. Replaced with titanium firing pin and that went up to about 9-12 with hard primer issue. So read around and found this particular one pop up often in forums and reviews to be seemingly used on many 7.62x39 builds. Conveniently we all had same issue being hard primers messing up our range fun. Well that has ended with this installed, I will say have a few firing pins stored in hand grip in case pin dulls. Even titanium likely will dull over time creating other issue.