Didn't see any obvious grip name ( XR3 or Red XR3 ) @ the Ruger website...
http://www.ruger.com/products/newModelBlackhawkConvertible/specSheets/0308.html
SO...
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Customer Service - Newport, NH
Service inquires for Shotguns, Revolvers, 22 Charger Pistols and all Rifles except SR-556, SR-762, AR-556, Ruger American Rimfire and PC4/PC9 Carbines.
Sturm, Ruger & Co., Inc.
Customer Service Department
411 Sunapee Street
Newport, NH 03773
Telephone: 336-949-5200 / Fax: 603-863-6165
(Monday through Friday 8:00am - 5:00pm ET)
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Customer Service - Prescott, AZ
Service inquires for PC4/PC9 Carbines and all Pistols excluding the 22 Charger Pistol and SR22 Pistol.
Sturm, Ruger & Co., Inc.
Customer Service Department
200 Ruger Road
Prescott, AZ 86301
Telephone: 336-949-5200 / Fax: 928-541-8835
(Monday through Friday 6:00am - 5:00pm MST)