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Sauer Koch,
I had Robar do a full K-frame along with some gunsmithing work before they closed, and that took a little over 6 months. Tyler at Robar even called me and admitted they had lost my project in the workflow and that it's shouldn't have taken that long. I didn't mind, as I figured it would be a lot of time since there was a significant amount of work involved.
I think a fair course of action would simply be to email them and emphasize that you're not trying to be a dick but the work is overdue by however many months from the stated lead-time you were given when you sent them the gun, and you're curious if the shop is still working and if there's a new projected lead time.
Personally, I wouldn't be surprised if new shops taking on NP3 services bit off more than they could chew and are up shits creek right now trying to manage orders and will likely be extremely late or simply vanish with peoples' money. It's really pretty common in the gun world. For instance, Tommy Bostic made a name for himself in the early days of HK cloning not just because he is decent at what he does, but also because he isn't a fucking piece of shit and he managed his business accordingly which wasn't a given for that market at one point.
Same with holsters. Lots of people have a pet project and passion, do some good work, quickly get in over their head and disappear.
Not trying to scare you or piss in your cheerios. I'd just start preparing for the worst; I'm just cynical and think most gunsmithing business are run by scumbags (I have no idea about the people you sent yours to).
As already stated by SauerKoch in the OP. It appears trying to compare lead times for NP3 work through the new NP3 service network and whether something is askew.