If you're a California constituent and inclined to take action you can find your California Assemblymember and Senator here ( https://findyourrep.legislature.ca.gov/ ) to voice opposition to California bill A.B. 2047 "Firearms: 3-dimensional printing blocking technology."

Alternatively, you could leave California and avoid a whole host of bad policy and legislation. Not that advocating is bad but of the two options one is guaranteed to be successful while the other is unlikely to help.