Had this cool idea of modding the Tank Battlecannon to use a Boarding Gun instead of a regular machinegun. It might spawn a custom sprite for it. The stats are autofire/4 and burst/3 with the same accuracy and speed as the mg.
Kinda got inspired by the fact the main cannon always ends up in the right hand slot even though (?) most people use it judiciously and use the machinegun primarily and would prefer opportunity fire to come from the MG. So using a boarding gun makes the ammo alot easier to resupply since it grows on trees, and nerfs the tank slightly because of overall ammo capacity, pretty much still the same strength. I figured out how to nullify fixed inventories to put them back in the order I want, so that the auxiliary weapon becomes the primary and the main cannon is the left hand slot.
Edit: And there it is. It takes less than one man hour for them to unscrew the stock and foregrip off the boarding gun and install it on this special carriage.
This is technically a new item so it doesn't replace any existing ones.