Hi Kelly, It could be something as small as a bayonet lug..Look at the restrictions here. We need to move from Ca soon! budsgunshop.com/catalog/feeds/state_reg/california_restrictions.pdf

handguns it sometimes is a simple as they have submitted and paid the state of CA for the "testing" to get it on the CA DOJ list

Yes this has a California Legal Muzzle Stabilizer (pinned on)(the muzzle is not threaded). galleryofguns.com/genie/default.aspx?item=MA9102CA ------ : opticsplanet.com/springfield-armory-ma5050-m1a-50-caliber-muzzlebrake-stabilizer-kit-ca-legal.html

Also most of the time it just shows CA compliant but is the exact same firearm with nothing different.

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