It appears to have had a single trigger at one time. The R is for Right barrel on the selector switch which was in the position where the rear trigger occupies presently. The stock appears to be an original Parker or Remington replacement, hence the R stamped into the wood. The Ser & ID book won't necessarily show what a gun went back to Parker for. I suggest you get a Research Letter.
XD5 and XC3 are two seperate Remington repair codes.
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