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Ruger uses a transfer bar, S&W uses a hammer block. Those are the weapons internal safeties in terms of firing function. The S&W side lock is a device to secure the weapon from being capable of being fired until disengaged, nothing more than an internalized trigger lock.
The directly comparable features are transfer bar vs. hammer block. Those are the devices that keep the hammer from contacting the firing pin unless the trigger is held fully back.
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