Could you use deodorant in a gbb and would it work?

No.

What’s a “gbb”?

In the Airsoft area there are various types of drive for the weapons. In addition to electric and spring tension which are the most common, there are also weapons which can be operated with different gases. Here is the so-called soft air gas, CO2 and also compressed air is coming back.

The abbreviation GBB stands for Gas Blow Back. Mainly present in short weapons (Pistole). Here, when the carriages are fired, as in a sharp weapon moves forward and back.