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The hammer spring is the primarily safety feature. Depending on the extent of the mechanical failure the firing pin spring could be providing protection also. Do not confuse the firing pin spring with the striker pin spring which is the spring that pushs (strikes) the firing pin into the round which ignites the primer.
A fail-safe is a backup feature that that counteracts a failure in a system.
what other ocean floor feature is fromed by movement of earth's plates
cold to warm
what other ocean floor feature is fromed by movement of earth's plates
oceanic rift valley
Precession
Brakes.
I believe there is no mechanical difference, it is just a stylistic feature.
Tubular Bells
Valves
Mid-ocean ridge