How to increase the number of slots in the arsenal? (Call of Duty: Advanced Warfare)

NazguLRU
I didn't pay attention before, but today I noticed! I have a max level, so there are 5 slots in creating a class and there is 1/2 on top to switch to the next page, there are 5 more classes. try it :)

Napalm561
I'm not talking about equipment layouts, but about inventory, where weapons from boxes fall.

like extra. slots can be purchased. but not 100% sure.