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John, that is intended for an AR 15 and attached to the barrel nut which is quite different from the PC carbine. I have not seen an OEM ruger part yet for replacing the handguard even though they have come out with a new version of the PC carbine that has one. This one from Midwest should work although I don't think Buds' carries it: https://www.midwestindustriesinc.com/MI-Ruger-PC9-M-Lok-Handguard-M-LOK-Compatible-p/mi-crpc9.htm

sorry it only fits the AR 15 style rifles