They do indeed. The Jericho is internally a CZ clone. At one point the barrels were even interchangeable without any real fitting required - might not be that way anymore since I sold off a good chunk of the CZ-themed portion of my collection a few years ago and haven’t played with them much since. There’s about a half dozen other guns that come to mind that also share the mags, as well as a few even more direct clones.
On the topic of similar things - Enfield revolvers are a direct copy of Webleys, to the point that W&S sued the British government for pattent infringement. I dunno which version of the Enfield is already in the game but I’m betting it’s a .38/200 model, which is just a garbage calibre. Accordingly and for variety, I’d beseech you to add a Webley in the much cooler .455 popgun. Of course, then you’d have to also add the neat Webley-Fosbery and Webley Automatic so that the Mk IV doesn’t get lonely being the only .455. Hell, I’d root for the .455 lend lease S&W Victory too. If there’s rare guns in this, why not add neat old ones too?
And just cause someone needs to stick up for the poor, ugly Johnson - it’s a very advanced gun for it’s time, and totally pioneered the modular rifle concept*.
A couple that I would suggest:
Lee-Enfield No.4 Mk.III* - .303 Brit, or .308 in the case of the AIA guns. I’ve also built a .45-70 version though I wouldn’t do it again IRL. C’mon. Best rifle ever**!
Lee-Enfield No.5 Mk I - .303 Brit. Shorter, but surprisingly also less accurate. Turns out all that wood does do something for the harmonics. Go figure.
A Charlton device mod for the above. Or one of the half dozen other automatic conversions that exist for these.
De Lisle Carbine - .45 ACP, intergrally silenced, all the badass of a lee-enfield but in a quiet pistol-calibre package. I don’t remember what mags it actually took - the one I built used 1911 mags and worked fine/looked ok. It might have been Thompson mags, but those aren’t legal here. IDK.
Kel-Tec Sub 2000, 9mm or .40 S&W, found in glock, s&w 4506 (I think), beretta 92, and sig sauer mag compatible versions. Folds in half.
Kel-Tec KSG -12 ga, 15 round shotgun. You probably already have this in there.
Kel-Tec RFB - .308, takes FN FAL mags, metric if that matters. Probably the most accurate bullpup I’ve ever shot.
Winchester 1892 - .44, .357/.38, or .45 Colt. I think this might be in vanilla but should be if it isn’t.
Henry AR-7 - .22 LR, takes down in three pieces, stows in the stock, floats.
TNW ASR - 9mm, but the 10mm version is much more badass and suited to killing things bigger than people. Takes glock mags, also takes down for storage.
Chiappa Triple Threat - 12 ga, three barreled shotgun. They’re kinda junk IRL but pretty cool.
BUL M-5 or Para-Ord P14 - .45 ACP, 1911 with doublestack 14 round capacity. The BUL is lighter, but if the Para is a later version, it probably works better.
A craftable punt gun. Couple pounds of powder and whatever you can fit in the end. You know, to go on my SUPERDEATHMOBILE duck hunting boat.
1847 Walker replica - .44 black powder I don’t think originals are serviceable very often, but this was a hugely powerful pistol for it’s day, holding only 10 grains less of powder than the original .45-70 load. Also weighs like 4 or 5 lbs and is just over a foot long, but they point surprisingly nice.
H&K P7 - 9mm. Just kinda neat, very far ahead of it’s time.
Walther P1 - 9mm, mags interchange with the P38. It’s a little lighter but the P38 works better.
Walther P5 - as above. It’s the compact version.
Colt All American 2000 - 9mm, my pick for one of the worst-functioning guns of all time, but internally neat.
Radom Pistol - 9mm. Don’t know why these aren’t very well known as even the Nazi-built ones are top quality guns.
Mag Research BFR - it’s maybe already in there, but should be if not. Take your pick of ridiculous chamberings, but .45-70 as a nice ring to it.
Bond Arms Snakeslayer - are .410s a thing in the mod? If not, it comes in everything from .357 to .45 colt to custom built .45-70 (which hurts, frankly).
Marlin 1895 - .45-70. The SBL comes with a rail for all your tacticool needs. I’m kinda coming off as a little TOO into .45-70s, aren’t I?
A simple craft to convert a flare gun to a single shot 12 ga pistol - it’s not hard IRL.
THink that’s what I’d suggest offhand. Sure I’ll throw millions more at you later.
EDIT: Oh, a few more.
S&W 52 - .38 Special if you want to shoot with the cool kids. Heavy, accurate target semi-auto.
S&W 59, 5904, 5906, 5946, etc. etc. - 9mm. These guns get pretty much no press, but are currently the most common semi-automatic in North American police service, and also see use with the some US military units. You’d think it would be a Glock or something, but no, it’s these heavy, well made pistols it seems no one has ever heard of.
S&W 4500 series - pretty much as the above, but in .45 ACP and not as common. They’re also out there in .45 Super, though I don’t think there’s a .460 Roland version :(.
S&W 460V - .460 S&W. You can also shoot .454 Casull, and .45 Colt from these. .460 > .500 IRL.
Which reminds me - does your mod fix the ridiculous “you can shoot .270 out of a .30-06” type stuff in vanilla? In that case, I’ll stop trying to edit my game, update to this version, and try your setup instead. And then likely spam you incessantly with this stuff.
*or would have if it hadn’t been mostly ignored.
**not really.