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I would give Ruger a call and get a 100% accurate answer Telephone: 336-949-5200

No the Barrel is not threaded.

Bill, this CA compliant model does have a 16.1" Threaded Barrel with Thread Protector Sir. The Featureless Stock makes it still CA legal. ----- https://www.texaspatriotarms.com/products/rifles-ruger-08510-736676085101-489

I would give Ruger a call and get a 100% accurate answer Telephone: 336-949-5200

Bill, this gun has a threaded barrel, you can see specs here--https://www.hinterlandoutfitters.com/8510-ar556-hera-p-74687.html

This model does have a Threaded Barrel (1/2″ x 28 TPI) w/ Thread Protector [No Flash Hider or Muzzle Device] https://www.thefirearmblog.com/blog/2017/06/09/ruger-pleases-nj-ny-md-ma-possibly-ca-residents-with-ar-556-legal-for-consumption-of-ammo/