LCG total health at vet ranks:
350
425
500
575
Ramjet/Sniper Rifle damage (& headshot damage)
180 (960)/100 (300)
198 (990)/ 110 (330)
225 (1125)/125 (375)
270(1350)/150(400)
Ramjet headshot is always a kill, recruit is 2 hits, every other rank is 3. Ramjets cost double the price of an LCG.
Sniper headshots are always 2 hits to kill. Every rank is 4 hits to kill. Snipers cost slightly more than LCGs.
I think this is more than generous to LCGs, considering that they don't take a lot of damage from many other dmgtypes. Gunner is far weaker to snipers than the LCG is. LCG is one of the tankiest classes in the game, 2nd only to epic units I believe. Tankiness comes at a movement cost.