No, I am unaware.
As for a 3-8? That come back to the old question of MMG vs HMG in ASL. Aside from the 12.7/13.2mm stuff, most nations did not have a separate medium and heavy class, yet do in ASL. The Soviet MG counter art shows a MMG as a M1910 Maxim and the HMG as a SG-43, yet they had the exact same function, the SG-43 replacing the M1910. The ASL distinction is really a design for effect to roughly simulate extra ammo, spare barrels, fancy sights, etc, maybe even an extra good gunner who has had his coffee, cigarette and/or Pervitin that morning. The 4 vs 6 or 5 vs 7 FP is a bit of "it seems about right".
Though the ASL depiction of US MGs do depict the real M1919 vs M1917 split, I would be inclined to give the M1919A4 the benefit of the doubt. It's still on a tripod, not being fired from the hip, so I would retain the 4-10. Indeed before FW came out I expected the M1919A6 to have been done as a 3-8, in line with the German MG-34/MG-42, both being belt fed bipod LMG.