It is a carbine, being better at long range than a full power rifle is unrealistic. And "m1_carbine_rifleman_spec_mp" is a clone of range's carbine.
Then it so not the weapon I was talking about.
It can simply say M1 C as improvement to their current weapon and the squad can get an extra symbol
1. May be, but "not very good" said by you is not a very solid reason for the upgrade being unbalance. The price, limited, timing and being in commander are more than justify it.
2. you are suggesting give them superior long range rifle, which will event good on the move if it take the exist profile, i dont see any positioning in such a set up (see pzfulisier), at least LMG need to be static to operate. A new profile can be made, but then it come back to the issue of being unrealistic and require additional work (see vicker K) compare to a simple tried and true LMG.
The suggestion is to be better long range but without concerted DPS in 1 weapon.
They would simply perform better at those range, they should not be able to beat long range infatry in their game.