Ok seriously now: I am pretty positive that lmg grens will win most long range fights vs a M1919 riflemen squad
M1919 long range dps: 6.138
rough dps with vet: 7.9794
LMG 42 : 6.517
rough dps with vet: 9.1238
Riflemen target size: .97
Vet 2 RA: .23
vet 3 RA: .15
Effective health: 630.0552...
Time till death: 69.05622 seconds
Grenadier's target size: .91
vet 3 ra: .23
Effective health: 456.6861...
Time till death: 57.2331 seconds
I did not calculate vet cool down. Both have a vet cool down bonus of 20% but it can be hard to calculate seeing the 1919 has a longer burst duration. This results in a slight favor for the grens but I do not know by how much.
Average burst duration:
LMG 42: .75
M1919: 1
Granted this is only looking at the slot weapons themselves, not looking at an additional BAR, and with stock riflemen, vs grens long range damage is usually a 50/50 toss up, the differences between these units are quite similar but riflemen do have slight advantage.