Wrong. The Rhino has a false hammer. It works via an internal cam/pin system. The visible hammer is simply a manual cocker, while the hammers on the hand cannons in Destiny indicate that they're fully functional.
The Rhino likely inspired the overall aesthetic of the hand cannons, but they're still functionally incorrect.
Also, I'm going to start copy/pasting this, since everyone wants to bring it up as if they're making some profound point.
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You are right. But your assuming that the hammer is fully functional on destiny revolvers. How would you know? It's a video game. You can't inspect it to find out. But as far scout rifles are concerned I fully agree with you.
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Because the animations support the assumption. On each trigger pull, the hammer is pulled back before striking the pin and firing the weapon. The standard hand cannon animations imply that the weapon is double-action, while the animation for The Last Word implies that it is single-action. In both cases, the hammer is shown to be striking the pin causing the weapon to fire. In the case of the Rhino, if the hammer does cycle in double-action mode, then it completes the action with a half-trigger pull, and the gun fires with a full trigger pull with no further action from the visible hammer (as the firing mechanism is internalized). Here's a video explaining how the Rhino functions. https://www.youtube.com/watch?v=6gQiXoiMl4c&feature=youtu.be&t=59