becouse it so cheep (55 ammo 30 fuel 210 mp) it has a PAPER armor so USRifles just happy to run to it.
It murders penals, it murders shocks, it murders vet0 rifles. There is 11% for rifles to penetrate it and it takes 25 penetrating shots to kill it from the front, which on average, rounding up, means it needs at least ~220 shots fired at it frontally to get it down.
The forums were just cleaned of one big steaming pile of crap(hi sierra), no need to add more.
And it doesn't cost 30 fuel, it cost 15, but then again it would skew wehr vs sov balance and their complete inflexibility and inability to get AT if they went T1.
Now, getting T2 and T4 could be between 10 and 15 fu cheaper, 221 should be able to arrive slightly faster then M20.