The problem is not with the unsafe handgun law (Penal Code section 32000). So long as your flare-gun based firearm meets the dimensional requirements and is a single-shot, you're compliant with the safe handgun law until the end of this year. Beginning next year, you must build a break-top or bolt action firearm to be compliant. Since most flare guns are already of a break-top design, that's not going to be too much of an issue.
The problem, and where you might be committing a felony, is with California's "Zip Gun" statute. Please check out Penal Code sections 17360 (Defining a "Zip Gun") and 33600 (Making it a felony to manufacture or possess a "Zip Gun"). There are four criteria that have to be met to be guilty of violating the "Zip Gun" Statute:
If all four of these criteria are present, you're a felon. In the case of the flare gun adapter, conditions (1), (2) and (4) are already present. You're relying on the excise tax exemption to keep you out of jail. IANAL, but as an LEO, I've parsed out the statutes and concluded that I would not arrest anyone who made fewer than 50 weapons in a calendar year. The "Zip Gun" statute was very poorly maintained, the federal tax laws changed following the adoption of California's "Zip Gun" law, and we have a very awkward result.
Others, and some probably smarter than me, have read the same statutes and have concluded there is no exemption from excise tax, and no mechanism for a personal builder to pay federal excise tax, and therefore the builder of a non-pattern firearm has constructed an illegal weapon.
I'd do a lot more homework before going down that road.
The problem, and where you might be committing a felony, is with California's "Zip Gun" statute. Please check out Penal Code sections 17360 (Defining a "Zip Gun") and 33600 (Making it a felony to manufacture or possess a "Zip Gun"). There are four criteria that have to be met to be guilty of violating the "Zip Gun" Statute:
1) The weapon must not have been imported by a licensed importer.
2) The weapon is not manufactured to the pattern of a licensed manufacturer.
3) No federal excise tax was paid on the weapon, nor was there an exemption granted from excise tax.
4) The weapon is a firearm.
2) The weapon is not manufactured to the pattern of a licensed manufacturer.
3) No federal excise tax was paid on the weapon, nor was there an exemption granted from excise tax.
4) The weapon is a firearm.
If all four of these criteria are present, you're a felon. In the case of the flare gun adapter, conditions (1), (2) and (4) are already present. You're relying on the excise tax exemption to keep you out of jail. IANAL, but as an LEO, I've parsed out the statutes and concluded that I would not arrest anyone who made fewer than 50 weapons in a calendar year. The "Zip Gun" statute was very poorly maintained, the federal tax laws changed following the adoption of California's "Zip Gun" law, and we have a very awkward result.
Others, and some probably smarter than me, have read the same statutes and have concluded there is no exemption from excise tax, and no mechanism for a personal builder to pay federal excise tax, and therefore the builder of a non-pattern firearm has constructed an illegal weapon.
I'd do a lot more homework before going down that road.

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