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Hi Daniel and welcome. It is CA legal. I would contact Ruger Customer Service for the NWCC stamp meaning at 336-949-5200 / (Monday through Friday 8:00am - 5:00pm ET). Cheers and stay safe!
On a Ruger GP100 revolver, NWCC stands for the Northwest Correctional Complex, a state prison facility in Tennessee. The Marking: It is a property or departmental roll mark. The prison system or state department of correction had the firearm custom engraved or stamped to designate official institutional property. Collectibility: These are often referred to by collectors as "prison guns" or department-surplus trade-ins. While standard GP100s are common, factory-engraved or department-marked institutional variants often attract niche firearm collectors interested in law enforcement or corrections history. This firearm is California DOJ compliant.