Polish OOB 5.5

[Marcello]

231 Ammo Carrier - in fact, special armoured ammo carriers were never used in Poland, especially on MT-LB chassis (armoured ammo carriers for SP-guns weren't Soviet practice).

No, but MT-LBs used as artillery tractors have racks for carrying ammunition internally (see an example here). So while there probably may not be dedicated armored ammunition carriers there are vehicles that could perform such task. From what I recall from past discussions it is an unit that some players feel to be rather useful, so if it can be kept around it might be worthwhile leaving it alone.