@Vakrug: Juku responded to your issues in ways that I don't have much to add.
Edit: Another one for the 'bad taste' section: the Ufopedia claims M60 is "...recently being phased out in favor of lighter SAWs". That is untrue. Light machine guns were never a replacement for GPMGs like the M60, and while it was starting to get replaced by the M240 in the mid-90s, that was another GPMG, and the transition took a looong while.
Wasn't written by me, how on Earth would I even know such things?
I'll try consulting people regarding this.
In retrospect, I should not have added any real weapons - someone will always dig up some obscure shit. Or at least I should 100% stick to Wikipedia articles.
Well, okay, I lie. There was a time when the US replaced their M60s with M249s. But that was in the 80s, and only in the infantry squad. That transition was roughly as complete as it would ever get by Desert Storm, half a decade prior to the events here.
Edit2: Note that this is also only the US. There is only ever one SAW involved, since a) SAW is a role not a weapon type (except in colloquial use and as an older designation for the M249) and b) SAW as doctrine is primarily an American thing due to their 'rifleman' obsession. Nor was there any general movement away from GPMGs in the 90s.
Edit3: I still find it strange that you can get access to heavy machine guns and secret squirrel weapons before finding any channels that sell RPG-7s. I mean, it's probably the #2 weapon the cult gun runners ought to have a great stock of.
Dunno, what's the difference in availability? Both are strictly military stuff.
https://openxcom.mod.io/the-x-com-files
I downloaded version 2.5 from here. If you start the game again, then there is a confusion of names and nationalities of fighters. Country flags are always wrong.
Yes, already reported and fixed. You can use the GitHub version of the mod if you want this to change, or wait for the next release.