- "Top break, over-under double-barrel shotgun. Long-range and in tactical configuration."
— In-game description
Unlike other shotguns, the BOSG.12.2 fires a single slug instead of a spread of individual pellets, giving it a much longer range and higher damage with a single shell.
Like the OTs-03, the slugs can penetrate Castle's Armor Panels, though it takes three rounds for it to go through all three layers in the Armor Panel and create a peek-hole. With enough damage, the slugs can also completely destroy an Armor Panel.
- For some strange reason, the BOSG.12.2 does not count towards any shotgun challenges in the Weekly Challenge System, only the rifle challenges.
- At one point on the Technical Test Server, the BOSG.12.2 was able to shoot through the windows on Presidential Plane, similarly to Glaz's OTs-03. However, this was removed for unknown reasons.