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Troy, the CA model has a specially designed California-compliant muzzle brake allows the M1A Standard Issue rifle to be sold in that state, instead of a flash suppressor. Other than that, they are the same.
Troy, the only difference is the California compliant model has a muzzle brake instead of a flash hider/suppressor because flash suppressors are restricted in California. Other than that they're identical. So if you don't mind the muzzle brake instead of the flash hider I'd get the California compliant model and save a few bucks. Personally I'd prefer the muzzle brake over the flash hider anyways. Hope this helps.
Hi Troy, the CA version uses an externally attached Muzzle Brake that does not require a Threaded Barrel making it CA legal. You are giving up a Treaded Barrel. Example of the CA legal Muzzle Brake is here : https://www.gunbuyer.com/spr-muzzle-brake-m1a-kit-california-legal-spr-ma5050-c.html