30 ROUND m1 AT BR3 BECAUSE OPTIONS, and history
The original M1 carbine had reliability issues with the 30rnd magazine due to the extra weight
Not saying your idea is invalid, just something one might wanna think about
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DF has never cared about that when adding weapons to the game. 
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30 rounds were not standard. Matter of fact, just like the m2, never saw service.
However some soldiers did modified and welded two magazines into 1 for 30 rounds on their m1 carbine.
Could work as an event weapon.
Edit
On second though, its probably easier and best to use the 30 round mag considering its already there on the m2 carbine.
Sure, it was a korean war varient, but we have post war jets and literaly post war machineguns ( mg45s, Rp46s known in game as beltfed machinegun etc )
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M1 carbine field mod would be cool premium or event gun
It would have jungle style mag which would allow faster reloading and extra pouch in the back for cosmetics. Ignore the scope