I guess I'll be the one to ask it then, how would this be balanced at all? Forgive me if I am wrong but the m2 does more damage, and suppression than the mg42, and maxim. Riflemen possess smoke and american early game is already good. What would be able to stop the best core inf in the game combined with the best machine gun team in the game right from the start? I've read in a few places that I am not the only one that thinks the 50 cal is the best mg. Americans would be able to just shut out axis like axis could with kubels. And before you fanboys start saying "It deserves to be that way cuz kubels were OP" let me tell you making something imbalanced for the other faction does nothing but satisfy your childish spite.
Well, first OKW since this is the easiest part.
OKW would still have the kubel, which already outperforms the .50. Easily. Not to mention you could flank the .50 and probably kill half of the crew with the kubel before it even turned to face you.
OKW still has grenades from the start to deal with MGs. A 4 man squad vs ONE Volks grenade. Try it out a couple times. Tell me how that works. Watch .50 cals become obsolete against any number of OKW elite infantry call ins from buildings with incredible grenades. MG Occupied buildings suffer critical existence failure at 2CP. Not to mention sturmpioneer flanks at early game, Pumas, etc. Lack of an ammo switch to incendiary/AP rounds for the MG crew mean a quick death to anything heavier than a Kubel. Allies still lack plenty of early game AT unless wasting fuel to tech to bazooka.
For Wehr, rifle grenade could clear the entire crew or 3/4s of it. 2 LMG grens focus firing would keep the gun empty and take the crew out model by model. Fast scout car. And while riflemen do well against Grens early on, the advantage starts tipping into Grenadier favor the longer the game goes all. All that has to happen is vetting and stalling until Scout Car and you're doing just fine against a T0 .50cal build with rifle support.
If you think the .50cal is the best MG in the game by any stretch of the imagination, you are insane and so are the other people who agree with you.