Originally Posted by Pruitt
There are literally dozens of different rounds for the 105 main gun. They are not all antiarmor. The round is smaller so they can fit more of them in the tank and they are lighter to manhandle. A 120 breechloading mortar could be shoe horned onto a Bradley and it might even fit in a C-130. I don't see Armor Branch going for anything smaller than a 105 on a "tank". Now you might have a chance if you call the vehicle an Assault Gun.
Placing a breechloading 120 mm mortar on Bradley should not be a problem with regards to it fitting in a C-130. Take a look at the NEMO mortar system for an example.