it is possible on a rifle impossible on a handgun as handguns must be on the CA DOJ approved list BY Model number. oag.ca.gov/firearms/certified-handguns/search

Jessie, I have heard from other members that if magazine capacity is the ONLY state restriction that some Buds personnel have offered to remove/replace magazines. I would contact Buds Customer Service to see if they will or not at this time at the Blue Chat now button at the bottom right corner 9am to 9pm Mon - Sat and 9am to 7pm Sunday.

no buds will not alter any firearm to meet state compliance.