I bought a SIG-Sauer P938 BRG in 2017 new off Gunbroker for $455 plus $20 shipping, and find it very useful for extremely low-profile carry of a real-caliber gun. Here is an amalgamation of posts and photos from around that time that I hope might be of use to you.
The fat Hogue stocks really work well. I have medium-sized hands with hollow palms: this gun works fine in them. Easy to draw from the pocket or the IWB holster. Easy to take a tight grip and make the thing run. Between the grip and the single-action trigger, it was easier for me to shoot quickly and accurately than my (larger and heavier) Glock 43 (this surprised me). Double-taps were nothing. I totally chewed up the head of a B27 at ten yards in shooting mixed 123- and 115-grain ball rounds, and I found the grip I was able to get combined with the trigger pull made one-handed shooting (strong or weak) easier to do well than with most guns. A real surprise in something this tiny. Really, a surprise.
The gun was reliable, which was a relief. Since I'd read that these were designed around 124-grainers, I led off with a box of Aguila 124-gr ball. 100% fine. Same with Aguila 115-grain ball. The head of that B27 was just flat tore up, especially once I got it through my muscle memory that it was a pivoting trigger and not a sliding one. (My initial rounds through the chrono were to the right, which I took to mean I was using too much Southpaw trigger finger. I got better with more rounds under my belt. Ultimately, I think the sights were pretty on. Accordingly, I'm just going to mention elevation below))
(Range at 5950' > sea level, c. 73°F, c. 45% humidity - ran some exemplar rounds through the LCR-22 and determined everything was working correctly.)
Aguila 123-gr FMJ: M 996.7 fps/S 42.67/D 13.62 (3" high)
Aguila 115-gr FMJ M 1048/S 27.42/D 9.94 (at POA)
I had problems with the 147-grain Gold Dots: they were too long for the mags, and tended to bind up in the front and nosedive. They worked well enough one or two at a time in the mag (running right at 885 fps almost 3" above POA), but on the last one of those I did, the gun bucked up against my fat tungsten carbide "back-up wedding ring," and tripped the mag release, shooting out the 7-rounder. Nope, no 147-gr Gold Dots for this gun.
Short-barrel +P Gold Dots were one of the first groups I did with the thing, before I really figured out the trigger:
These did 1114/20.02/12.76, and had some STOUT recoil compared to the not-much-slower standard pressure 124-grain JHPs.
Remington Ultimate Defense 124-gr BJHP M 1056/61.29/23.28 - this is what I'm carrying.
Hornady Critical Duty 135-gr +P FTX rounds showed (once again) that they need a longer-than-3" tube: M 989.9/46.46/18.81
Remington old school HTP 147-gr JHPs were remarkably consistent but not all that accurate (3" high and sloppy grouping): 885.9/9.04/3.46 (!!!). Just goes to show that consistency doesn't guarantee accuracy.
No failures of any kind but for the too-long-for-the-magazine 147-grain Gold Dots. I didn't put any +P+ through the gun, because it strikes me as a little delicate: I'm grateful that it shoots 9x19 from a platform this size, and I just don't feel the need to abuse it. The standard pressure Remington 124-grainers were a lot easier to shoot than the blastier +P Gold Dots, and they weren't all that much slower. I'll baby the gun and avoid the RA9TA, etc.
I'd read several posts saying this gun was difficult to re-assemble - I find it is a piece of cake.
The gun carries very easily in a Remora IWB or in pocket. It's really small, so I'm grateful that this has turned out to be reliable for me thus far. I'm flat-out blown away by how easy it has proven for me to shoot well. Those Hogue stocks are something else (you can see this if you look at their wildfire popularity on the forums right after they were introduced), and really put the cherry on top of this sundae.
Not that impressed with the night sights: in the first place, I don't think they're necessary, and in the second, these aren't that bright as the breed goes. Whatever. I like the ambi safety set-up but am not in love with the mag release - once again I'll bang on my pot to voice my opinion that a tiny gun should come with a butt release (this ain't IPSC and I'm not Rob Leatham). The 3" barrel is short: really the minimum for a 9x19, and I'd rather have a 1/3 or 1/2" more. The single-action C&L carry is a whole lot less of a concern than I would have thought in a small sometimes-pocket gun: the safeties work and I find them to be easy off. Plus I like the fact that you can run the slide with them up (like on my SIG-Sauer P220 Compact Elite SAO) - it makes for an extremely safe loading and unloading.
Am I happy? Yes, indeed. Warm fuzzies from this thing. It's one of those things like with my micro-SD cards . . . I remember being a kid and thinking, "Wouldn't it be great if I could have a library that fit on storage the size of a postage stamp?" Well, now I can. And my thought, "Wouldn't it be great if I could have a 9mm that was the size of this .25?," has been similarly answered. I like my P938.
Further note: there appears to have been a lot of discussion about whether the sticky rubber of the Hogue stocks clings to clothing to make the concealed gun either more evident to an observer or more difficult to draw. (I've certainly found this to be the case with rubber Hogue stocks on other guns.) On the P938 BRG, I've found that the first issue (the rubber clinging to fabric to make the gun more evident to an observer) is not a problem - the area of rubber is just so tiny that even clingy fabrics don't appear to "grab" it. The second issue (rubber interfering with the draw) seemed to be a small issue with pocket carry in a business suit, but not from jeans. I'm finding that my draw from pocket-carry (as is generally the case with pocket carry of various guns) does not allow me to take the vaunted "firm final firing grip" (again, I'm not Rob Leatham and this isn't gun-gaming): what I do instead with the SIG-Sauer P938 BRG is to curl my two fingers around the frontstrap and place my thumb on the underside of the (cocked) hammer. I then simply pluck the gun out of the pocket, assume the final grip, and bring the gun up.
Update: another chrono reading:
Golden Saber bonded 124-gr +P (same range, 67 degrees Fahrenheit, c. 45% humidity)
M 1081 fps/ES 55.48/SD 21.70
And snappy!
I'm sticking with the standard pressure stuff for this gun.
Some additional comparison photos, these with the P938 and the Beretta Nano:
A pic I liked of the P938BRG and the Victorinox Spartan:
Sucker really is tiny . . . like pretty much the size of a Raven:
I've cut an iPhone-sized piece of plastic landscape edging that I lay on top of the gun in my pocket in a Blackhawk! pocket holster - even in tight jeans, this amalgamation looks like a cell phone.
These next two images are reversed by the mirror I used to capture them - that's my left hand in the second photo below (trigger finger curled not to go into the trigger guard but to make the gun visible), and the gun and holster are both in the first
But it mostly rides in a tuckable Kydex AIWB rig from Key Brand Gear - I wear it tucked with business attire:
I hope this was of use. I'm glad I have mine.