不是加州的就不用问了
加州买off roster handgun 的变通办法, 15年1月号就不合法了
SUMMARY:
The 'single shot exemption' or 'SSE' is an exception to California's Roster of Handguns. Guns in the SSE configuration may be sold in California, regardless of whether they are on the Roster. They must actually be safely functional, and must be capable of firing only one shot before reloading.See also BWiese Feb 8 2014
Once delivered to the buyer, the original parts may be re-installed and original functionality will be restored.