these are the armor changes for the M4:
- Effective LFP was buffed from 140mm to 150mm;
- Effective UFP was nerfed from 120/130 to 115/130 (but the 85mm hatches weakspots were removed);
- The turret is a bit smaller and the armor is roughly the same;
- Commander cupola became smaller but its armor was nerfed from 140mm to 95mm.