1sailor:
Bear in mind that these are essentially SD guns, stamped out in large lots for the Law Enforcement market and other concealed carry (especially the Compacts) uses.
Being able to put six or so rounds into a 6" circle at 30' is about all we can really expect.
(My 40FS came through with both the front and rear sights way off. I don't know how the thing got out that way, but it wasn't too hard to fix that.)
Presuming you get a good one (both my 40C and 40FS seem to be), you can expect to do that all day, and make a mess out of a bullseye target at about 50', too.
As to "match barrels" and other silly stuff, forget it....
However, the Apex DCAEK kit (or just the drop safety plunger mod) smooths the trigger feel out quite a bit, removing some of the nasty Tuppergun Trigger effect.
Just IMHO, of course.... Also, adjustable sights don't excite me - especially on a carry gun

.... There is a slight advantage, presuming the gun's tight enough to hold zero, of moving the sights around so POI equals POA, but it shouldn't be that far off for Combat use....
Back in 1968, I ended up having to grab a 6" M19 Combat Magnum, with a Patridge front sight and an adjustable rear sight. The Military was grabbing everything, and I needed a "duty" gun (rent-a-cop, among other things).... I haven't carried it for decades, but it survived three or four years on-the-belt (and gouged the heck out of several steering wheels), and is still exactly where I put it back then. Miracle, I think....
Some months later, I needed a "concealment" gun - I can't hit anything with a snubbie - and found a 4" M10HB (non-adjustable sights). Nobody cared about printing in those days, and I'm kinda big. Both of these guns are tack drivers if I do my part, but neither were stamped out like Tupperware, either. The 4" shoots as well as I can....
Mostly, those two hand-cannons were
confidence out on the street. Fortunately, I never needed to fire either off the range, but I always knew that I could do what was necessary without worrying about the gun.
I feel the same way about my two EDC rotation 1911's, and about the 40C. (And, once in a while, the 40FS feels like riding on my belt a bit, too.)
Regards,