I have no dog in the fight, but I will throw in something that may be of your consideration. It should have already been solved long ago however I am skeptical of any new things, I always let the others to be guinea pigs for me.
However, what absolutely killed vp9 for me is how, at least when they came out they would fail to fire as soon they are wet. As soon any water got into the striker channel. This is absolutely aggravating for me for I know, for this to happen, HK was negligence with the development of this pistol. This flaw would be discovered with any basic torture test a simple shooting in rain or dipping pistol in water. The neglect of HK to not have the striker or the striker channel grooved so it would not be hydro-locked in the channel or having the resistance of water presence in striker channel being sufficient to slow down the striker's velocity thereby momentum, preventing it from impacting primer with sufficient energy. As I understand it, with hammer-fired the pin can be loose in the channel and the hammer can have a lot of power, enough that it overcome any water that can fit into the firing pin channel and in many cases solid foreign matters. But with strikers, it may be required for the striker to be tighter in it's channel so the gun would be safer and trigger pull would be more consistent as opposed to striker having slop in the channel and having slightly different angle and position in the channel with every firing, the trigger firing sooner or later than expected. Think. The striker being up against the ceiling of the channel for one firing (shorter trigger pull) then next firing the striker is lower in the channel(longer trigger pull). In this case, if design limitation calls for it, HK should then have the striker made of top-grade steel or titanium and grooving or fluting it and possibly increasing the spring force behind the striker at cost of "nicer trigger than Glock". So the water can freely move past striker as it fire.
At the time, the VP9 appears to me, equivalently to say Wilson combat making piece of shit liberator pistol to appease drooling retard peasant masses who at first hate Wilson combat calling them overpriced and so on then fall over themselves clamoring for cheap POS pistol with "WILSON COMBAT" written on it and feel as if they belong to the club!(oh man! I chuckled as I write that.) At time Vp9 does not feel like it shares the linage of previous HK pistol of bulletproof reliability. HK damaged their reputation with me with vp9.
However, nowadays my view is, as long they revisit it, making vp9 a solid reliable pistol to the level of at least 60% reliable as USP then it's a go from me barring another design failure.
I tried to find few video I saw of vp9 failing to fire when wet only managed to find one, it's from MAC. It's linked below, skip to 2:48 to see the pistol dropped into a mostly clear water puddle and stepped on few times then picked it up and fire it until it fails a few times. Since this subject is brought up, I throw in this, I believe I remember that vp9 is not an only striker-fired pistol that fails when wet.
https://www.youtube.com/watch?v=vOu5ZGfgtVk
I demand absolute reliability from all of my tools and equipment.
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