They loose to 7 man cons from mid to long at vet 0 and at vet 3 across all ranges. Let that sink in a 270mp+60mu gets it's ass beaten by 258mp+50mu unit. IDK about being "no longer OP" i'd like to see a bit more consistency. may be we should change the con 7*12>80 ing people.
I just did a test in cheat mod and 5 Men Grens won 3/4 at medium-long range at Vet 3. The one they lost was because Cons got a lucky early model kill and swung the engagement. You're welcome to provide evidence to the contrary but I don't really believe that they lose at longer ranges. Both upgrades add an extra model and Grens natively have better long range DPS. The STG also has better long DPS than the G43 as well so I don't see how losing the 10% Racc means they suddenly lose to Cons long range without the LMG42.