FOUND A SOLUTION FOR THIS BUG:

COPY AND PASTE the following commands exactly as they are on console and enjoy (respect the "", those are there to clarify that you select nothing as the default pistol and knife)

mp_t_default_secondary ""
mp_t_default_melee ""
mp_ct_default_secondary ""
mp_ct_default_melee ""
mp_restartgame 1

You will have to drop the revolver after you win the round or restart the game