Some designs combine the hammer and firing pin into one part called a striker. If you ever look at a bolt action rifle you'll notice that the cocking piece (if it has one) is directly attached to the firing pin. The whole part works against spring pressure so that when released by the trigger it will fly forward and (hopefully) ignite the primer. This kinda takes another step out of the equation. I think the Walther PP works in this manner although it incorporates another mechanism to allow a double action pull wheras a rifle has no such device.
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