I admit my trend in gaming tends to run more... not current, but it always threw me off a little when playing un-modded Stalker and the lengths they went to NOT use the actual names for in-game guns.

Thank goodness for mods.

I mean, there are alot of gun manufacturers that are actual big deals, money wise, so game devs atleast try to paste on a fig-leaf of deniability so as to deflect any legal attention if said companies don't like the association.