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Yes. Jose this pistol is legal to register in California. : https://www.budsgunshop.com/catalog/product_info.php/products_id/69875/H%26K+704001-A5+USP40+10%2B1+40S%26W+4.25+V1 ----- Details here : https://www.oag.ca.gov/firearms/certguns?make=Heckler+%26+Koch

here are the CA approved HK guns and yes there is a USP 40 10+1 on the list https://www.budsgunshop.com/catalog/index.php?cPath=2084_1153_1796&filter_id=486