#122mm

The T-10A is the big brother of the IS-3, featuring the stabilized D-25TS and almost double the reload speed; it fixes most of the issues of the IS-3. However, unlike the T-10M, it still has the older D-25 gun with a worse stabilizer: the gun still has enough penetration to go through enemies, but still not enough to not have to target weak spots of certain enemies.