It looks like Vera Rockrose has a penchant for large airsoft guns for her to feature in her videos. For this video she goes for a large revolver in the form of the Marushin X Cartridge 8mm Raging Bull 6.5-inches. This is based on the Taurus Raging Bull and it is a hefty revolver to hold as based on our experience with the real one. Furthermore, this uses 8mm BBs rather than the usual 6mm.

Update:  A reader, pointed out that the revolver is the Marushin X Cartridge 8mm Raging Bull 8.375 Inch HW 8mm rather than the 6.5" version and he is corrected as the revolver has 4 ribs rather than 3 indicating it is the 8.375" version. Thanks to Gabriel Gaitan for the correction.