Can buy the factory Ruger ones from Brownell's, Midway or Ruger directly. They'll need to be fitted to your grip frame and finished as they come "in the white". You'll also need to install the grip locator pin and the trigger spring retainer pin. if you have the patience and skill it's an easy conversion. If not, figure $100-125 or so for it to be fitted and finished.
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Shoot safe, shoot often
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