From Player Support Team
Dear players,
Please note that with update 1.10 the 12.8 cm 44 L/55 gun for the E100 and the 122 mm D-25T gun for the IS-4 are not available for these vehicles anymore.
However if you owned these guns they were not removed from your accounts, they are still available in your depot to be sold or mounted on different vehicles.
wut…
oh wait nvmd,they changed them i forgot