Or you could just get a BAR and have an objectively better squad. Problem with 5 carbines is a) that's wayyy too weak for 60 muni and 2 slots and b) BAR'd squads keep more of their DPS when they lose models because like half their DPS or something is coming from the one (or two) BAR(s), so even when they drop models they still have a ton of DPS, but with carbines it'd be a linear reduction with each model drop. That's one of the things that makes weapons like BARs and LMGs so good.
1. Make it a cheap techless 45 munitions upgrade that comes at 1 CP.
2. Gives 4 elite carbines.
3. Only takes up 1 weapon slot.
Now it gives a lot of early momentum, but your rifles will be slightly weaker lategame than with double BAR's.