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John, yes Sir it will work on the Ruger PC Carbine. Since the Carbine is longer than a Handgun, I would consider a "longer "Remote Switch" for activation. --- https://www.amazon.com/Streamlight-Remote-Pressure-Switch-Coil/dp/B000UFX42Q

John, this will attach to the small rail section on the bottom of the handguard but may be a bit awkward as it is intended to mount to a pistol. It should come with a few small "keys" for mounting to various different types of rail, not sure which one comes pre-installed but you'll want the one marked 1913.