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- "Designed for high damage at a short-medium range, the vertically inverted barrel alignment naturally reduces muzzle rise and recoil."
— In-game description
The Keratos .357 is a handgun featured in Tom Clancy's Rainbow Six Siege. It was introduced in the Operation Para Bellum expansion and is available for use by both GIS Operators and the NIGHTHAVEN Operator Wamai.
The Chiappa Rhino is a revolver produced by Chiappa Firearms of Italy. It is chambered for .357 Magnum, 9mm Parabellum, .40 S&W, or 9×21mm cartridges. The Rhino's most distinctive feature is that the barrel is on a low axis compared to other revolvers. The Rhino fires from the lowermost chamber of the cylinder, rather than firing from the topmost chamber.
In-game, designated as the Keratos .357, this revolver is functionally similar to the GIGN's LFP586, with exception to its ability to equip barrel attachments. As such, like the LFP586, it can kill any Operator in two shots at its optimum range, regardless of their Armor Type.
Alongside this damage is the relatively low recoil kick that allows the user to take advantage of its high, long-range damage. Overall, the Keratos .357 is suited for any range of engagement, if only held back by its low six rounds capacity.
- Keratos means "Horn" in Greek, a nod to the revolver's actual name, Chiappa Rhino, as its namesake is known for their horns.
- In reality, a revolver such as the Keratos wouldn't be able to use a suppressor effectively. When fired, expanding gas escapes the gap between the cylinder and the frame, which would create a large noise regardless of whether or not a suppressor is attached to the muzzle.
- While it is a very obvious adaptation of the Chiappa Rhino 40DS, Ubisoft implemented an extremely subtle and clever way to avoid breaching copyright in its model. The backspur on the grip is shorter than the real Rhino, and all of the pins holding the frame together are about half the size of the real life revolver, which is enough under copyright law to avoid a lawsuit. This also brings into question Ubisoft's explanation for reusing weapons for new operators as of late, as they had claimed they can only license a certain number of firearms for one reason or another, but doing something like they have here (And on other weapons like the MP5 and M4) would avoid that issue, leading to skepticism among players and critics.
- The reason for the barrel to be aligned with the bottom cylinder, a very non traditional feature amongst revolvers, is to reduce vertical muzzle flip, as lowering the center of the recoil force, known as the bore axis, causes more of the recoil to direct rearward, as opposed to upward, making follow up shots much easier to accurately execute.