The fact that both Lwt16 and Texaspoff have expereinced repetitive and apparently systemic QC issues (i.e., the specific lack of QC) is discouraging, to say the least. The problem is compounded by the relative complexity and various small components that comprise the FCU, making it seemingly not to be disassembled/reassembled by the untrained and uninitiated.
What I'm hearing is that it's (the FCU) a relatively complex unit, and that SIG can be unsupportive to their armorers and lacking in replacement components, at least in terms of providing them to trained and certified armorers.
It's been pretty well established that a trained monkee can detail disassemble/reassemble a Glock (hey, I'm a trained and certified Glock monkee!), components are easily available and installable, and the design is simple and robust. While I prefer the ergos of the P320, and the modularity of it (and have personally taken advantage of it), I'm getting leerier and leerier about the platform in general.
Mine will probably be a "one and done" P320 platform comittment. It's a shame HK isn't providing adult supervision to SIG, because I think that a well engineered and well manufactured/QC'd P320 has huge potential to a variety of firearms user niches.
Best, Jon