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The shape of the hammers are the same, but on a firearm with rebounding hammers after being fired the hammers bounce back off the firing pins to half cock, under power of the main spring, and allow you to open the gun with nothing else needing to be done. On non rebounding guns you need to manually put the hammers back at half cock before you can open the gun. Rebounding guns are just that little bit faster to use.
It was considered that big of an improvement that many guns built before the invention on the rebounding lock had the locks converted to rebounding at a later date.

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The hammers don't rebound all the way back to half-cock, but between fully down (striking the firing pin assembly) and half cock. Most hammer doubles with rebounding hammers and stalking safeties still must be brought to half-cock to apply the stalking safety, and then, safety off, must be brought to full-cock in order to fire.
One very good reason is that the firing pins are allowed to spring back away from the primer so when the gun is opened, there is no hindrance of the firing pins dragging out of the primers with the risk of damaging the pin tips.

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He who lives in the past is doomed to enjoy it.

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