I've owned a SW999c since just before they stopped making them. I also own an older SW9940, but the 999c is my favorite between them.
Mine had an early issue with a slightly out-of-spec trigger bar guide (too tall) which caused an occasional light striker on the initial DA trigger press, but it was identified and easily enough corrected.
Other than that, it's been an outstanding little pistol.
While the grip isnerts just change the shape of the backstrap (unlike the subtle palm swell change possible with the M&P pistols), I find it offers a surprisingly good grip profile. Better than the standard size model in my hands.
It's light weight, slim & decently ergonomic. It has a nice balance, "feels lively" in my hand during live fire and offers good controllability & recoil management.
I've fired just over 11K rounds through it, using a mix of various duty & training rounds, including 147gr JHP, 115gr FMJ & JHP, 124gr & 127gr, and covering a range of standard pressure, +P & +P+. I've replaced the recoil spring assembly a bit sooner than the recommended 5K rounds, but that's because I've been using +P & +P+ duty loads and I suspect they're probably a bit harder on springs and might accelerate normal wear & tear.
I like how the slim little pistol, even though it uses a 10-rd magazine, feels as slim in my hand as the 3913 which uses a single column magazine. I noticed the last time I ordered magazine springs that they seem stronger than previously.
Although I wasn't experiencing any functioning issues, I replaced the striker & extractor springs at just over 9K rounds. (I was doing some preventative maintenance on a couple of my Glock subcompacts at the same time, which have seen similar service usage/round counts, so I decided to just replace the springs in the 999c while I was at it.)
The new striker spring appeared longer than the older one, and the newest ones I'd ordered appeared longer than some remaining "new" striker springs from my older parts collection, too. Oh well, companies are always making minor revisions and refinements to their products.
I really like mine. The trigger, being the standard Walther design that offers an initial DA trigger press when it's decocked, has become very smooth, light and predictable over the years (as seems pretty typical of the 99 design, in general). I find I can usually wring some extra inherent accuracy out of it compared to my 3913 simply because it has a "better" trigger, in both DA & SA modes.
This is one of those guns that suits me so well that I rather wish I'd ordered a pair of them back when I bought it ...
