General requirements are 18" minimum barrel length, 26" minimum overall length.
Most conceivable configurations are allowed, including:
- Folding stocks (minimum length measured while folded applies).
- Bayonet lugs.
- Pistol grips.
- Detachable magazines (Saiga's converted to single-shot,
There are a few restrictions:
- No detachable magazines (bullet button, etc, ok).
- No folding or telescoping stock in combination with a pistol grip, thumbhole stock, or vertical handgrip
California bans certain features on Semi-automatic Shotguns
12276.1. (a) Notwithstanding Section 12276, "assault weapon" shall also mean any of the following: (6) A semiautomatic shotgun that has both of the following: (A) A folding or telescoping stock. (B) A pistol grip that protrudes conspicuously beneath the action of the weapon, thumbhole stock, or vertical handgrip. (7) A semiautomatic shotgun that has the ability to accept a detachable magazine. (8) Any shotgun with a revolving cylinder.
Note that you may have a folding stock as long as you do not also have a pistol grip or thumbhole stock and vise-versa.
Only both of these features combined trigger "assault weapon" status.
Provision (8) applies to all shotguns.
There are no 'assault weapon' implications of magazine capacity together with shotguns.