
It looks more like Fallout 1 & 2 threw some generic weapons that were popular in 90's games and movies for familarity vs. actual story reasons (considering that all the above weapons fire cartidges that are NOT commonly adopted by Fallout militaries, it would not make sense for them to even bother developing/obtaining them for use in their world).


Additionally weapons such as the generic M16/M4, AK, and FAL persuasion are more or less thrown in for familiarity vs. 308 (apparently 7.62x51mm either does not exist or it is not specified in this Universe). Infact the military heavily uses the 10mm, 5mm. Supposedly in the Fallout Universe 5.56x45mm/.223REM, 9x19mm, and 7.62x39mm were not commonly adopted cartidges of the major militaries in the world as they are in our reality.

To be honest, the simple "generic" weapons of the previous games didn't really make sense either.
