The devs standardized the ammunition of assaulter guns to 150 in total. More or less.
Earlier on in the game’s history, when assault rifles and their “counterparts” were introduced, they were “balanced” by having 1 less magazine in reserve. Though, I genuinely don’t see why that should remain the case when LMGs, which were originally capped to 100 rounds of ammunition, have a roughly 150 round limit with 75rd belts and a 200rd limit with 100rd belts to accomodate 1 magazine and their 1st reload.
I don’t see the need to impair the ammunition count of assault rifles and thompsons given that their only advantage over automatic rifles any other class can equip is their ammunition total and aim speed, being the only automatics in high tier that cannot oneshot a soldier by default.
All I ask is that they be standardized to more or less 150 for consistency.