I don’t mean existing science fiction guns or such I mean take a ww2 gun and make up a variant.
For example:
Walther P38 exists
Luger P08 Artillery exists
The made up gun:
Walther P38 Artillery with extended mag, barrel and pistol stock.
I don’t mean existing science fiction guns or such I mean take a ww2 gun and make up a variant.
For example:
Walther P38 exists
Luger P08 Artillery exists
The made up gun:
Walther P38 Artillery with extended mag, barrel and pistol stock.

I see what you’re saying. Would need to call these weapons “custom” or “field mod” to feel more believable imo.
Yeah imagine that but a Walther P38 instead of a Luger.
I get the premise of your idea, I’m just having a very hard time coming up with an idea that isn’t already a thing (even if only prototyped)…
For example, my first thought was; “A belt fed Bren gun”.
But then I remembered that’s already a thing:
Rule of thumb for gun designs; if you can think of it, its probably already been tried (or there was a very good reason for why it wasn’t)
But, I’d rather not see made-up guns added… sorry.
Oh yeah this is in mess as it’s just funny making scheiß up, not actually about adding them to the game.
One of the things I always wanted to see was a semi-automatic Kar98k in 8mm Kurz and a simplified STG or most likely a better VG1-5 though, in fact, something similar to that did exist in the postwar period.

Spanish prototypes based on the STG
There’s also this picture of different guns based on the STG family wich i don’t know if it’s real or not

As for combinations, modified weapons, or prototypes: an extended or drum magazine for the StG sounds viable; an SVT-40 modified for 8mm Mauser wouldn’t require major changes and someone maybe did it; Japanese Type 96 and Type 99 LMGs with belt feeds or side-mounted magazines; and definitely an MKb 42(M) with a 30-round magazine.
Edit: the images i modified them with AI from the actual design of the MKB42 (M) in game
This is just an extra to appreciate the designs since we’re on the subject, a “Mauser” family of weapons instead of H&K; it was a “what-if” concept I found on Artstation a while back.
Didn’t the Czech basically make a better VG 1-5 before the VG 1-5 existed?
Also damn that’s cursed. An StG 44 with an MP40 folded stock…
Actually, now that you mention it, yes the ZK412. The Germans captured it but for some reason they were so busy over-engineering the MP40 that they never actually copied it. XD
Yeah, though in this case, it would be more of a sliding-stock design like the Italian TZ-45. It was definitely a rare find, but I came across it back when I was really into “what-if” concepts which, ironically, started with warships.