Are there states that require the registration of rifles? Massachusetts doesn't, but I see
California does.
"The California Department of Justice ("DOJ") retains information about the purchaser and seller of
all in-state firearm sales and transfers, and requires that any firearms imported into the state be
reported to the DOJ.[14] Furthermore, the Attorney General is required by law to maintain a registry
containing the fingerprints and identifying information of the transferee, and the unique
identifying information of every firearm transferred in the state, pursuant to §11106.[15]"