Well like I stated in my previous post the lower half of the firearm can be dismissed as causing or being the issue. Take off the slide pull the trigger forward till the trigger safety catches the frame (like a glock) release the trigger slowly (however you want to hold it) and as it gets pulled back by the trigger springs.. nothing catches. Just smooth action. Now to test the slide possibly the striker spring. I used a screwdriver flat head and pushed the stiker back all the way several times. No catch nothing snagging no "boing" noise. Also pushed the safety aside no catch there either. Only two things left. The interface between the striker lug face and the trigger bar. And the trigger bar (lower lug) and disconnector. Something is catching here. Thanks for your help I do appreciate it.
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Ah, missed the part where you took the slide off. It could also be happening where the triangular lug on the trigger bar touched the leg on the striker safety. Maybe the safety is snapping over a burr or scratch at the end of the trigger stroke? If it's at the striker leg face/trigger bar ledge, it could be a result of the starting angle of the trigger bar. I bought two P10Cs a month apart, and they had dramatically different trigger bar heights. The ramp on the disconnector that the trigger bar lug interfaces with was cut differently. You can see the difference below. The trigger is to the rear in both cases.
I could feel the difference in the trigger pull. The higher trigger bar had a mushier break but less overtravel and was also slightly lighter and smoother. In my terrible drawing below you can see why. In this exaggerated example, with the low trigger bar, the top corner of the trigger bar ledge has to rotate into the striker leg, when it flattens out, that corner adds resistance. With the higher trigger bar, the top ledge doesn't flatten out against the leg, it rides the striker all the way to release since the angle falls away from the surface.
The last thing could just be the slide moving down as you pull the trigger. Without a magazine to provide upward pressure, the slide is free to move vertically. The hitch you feel could simply be the slide bottoming out on the frame rails before the trigger bar starts sliding down the striker leg.
None of this explains the "boing" noise though. While I hate the generic answer of "just shoot it", I'm tempted to say just that. The P10C internals are coated with black oxide, which is about as smooth as chalkboard paint, and needs to wear off a bit in the right places. I wish I could give you a better answer than that, but I'm pretty stumped at this point.
