There is a max limit of things that can show up on the hotbar. 21 total combined between all installed manual fire weapons and tools (sometimes bugs out to 22). If you install more than that they simply won't show up. The game chooses which ones it will show if you install to many.
How many guns and tools total do you have installed? Not how many different types.... How many total? For example, if I install 30 rocket launchers and nothing else, I'm already over the 21 limit. The game will choose 21 of them to work and the rest will do nothing. How many total weapons and tools, all added together, do you have installed? If you are under that 21 limit, and they still aren't showing up, we'll need a copy of the game save to look into. Turrets don't count, only manual fire weapons and tools count. Edit Also, they have to be facing the same direction as the cockpit. If they are turned sideways or backwards to the direction of your cockpit, they won't show.
