Do you have pics of the hex screw location by any chance? I have the trigger will not release the striker issue. Saw in an old post that adjustments to the hex screw may fix the issue. I have an old gen 1 with the pivoting trigger.Unfortunately SOME P99s stack, and some do not. I have felt some in the store that were completely smooth all the way to break. Not mine. My best is an old Gen 1 but it does it a little. Much of it has to do with QC of the FC parts - namely the striker and sear. What can be a bit worse is the overtravel which can be considerable and is harder on first shot accuracy and likely the worst part of an otherwise decent trigger. Obviously Walther could fix this with some QC, but there is not much interest in DA/SA guns at this point.
Some use the little hex screw that regulates the trigger bar, but I have not had any luck with it.
Yes, trigger time, rounds, and practice make it much better, and you CAN train right through this, but it is aggravating because it doesn't have to be there, and if the overtravel and stacking are minimal it is one of the best DA triggers you can have.
Your old Gen 1 may not have the set screw. I'd suggest sending that pistol to Earls Repair Service. He will have the parts and the knowledge to fix it.Do you have pics of the hex screw location by any chance? I have the trigger will not release the striker issue. Saw in an old post that adjustments to the hex screw may fix the issue. I have an old gen 1 with the pivoting trigger.
Or it means carrying with the trigger pre-set to SA mode while a round is already in the pipe. Unfortunately, doing so entails pulling the trigger partway back, something that clearly violates a basic gun safety rule ("keep your trigger finger outside the trigger guard and off the trigger until you are ready to fire") -- which is why I don't do it, myself, and don't recommend it.While Blitz and UE make a good point there is an underlying issue. Even under extreme stress that first round needs to count.
That means good finger strength and control.