A quick look at the features of the Baton Airsoft BT-PIT Viper GBB Pistol by Fortress. The BT-PIT VIPER CO2GBB is the fourth edition in the BATON CO2GBB 2011 series. It's an upgraded version of the firearm used by the protagonist in JW4. The exterior parts have been almost entirely redesigned to mimic the full custom look.