Jason, yes Sir. Pump shotguns do not have the same restrictions as Semi-Auto shotguns. Details under Shotguns here : budsgunshop.com/feeds/state_reg/california_restrictions.pdf

yes it is 100% legal Prohibited:
✘ Shotguns with revolving cylinders (e.g. Franchi SPAS 12, USAS-12, Striker-12, or Streetsweeper).
✘ Semi-automatic shotgun that has both a folding/telescoping stock and a pistol grip, thumbhole
stock, or vertical handgrip.
✘ Semi-automatic shotgun that has the ability to accept any detachable magazine.
✘ Shotguns with tubular magazines in which the combined ammunition capacity exceeds 10 rounds
AND can be fired by the shooter without either manipulating the magazine selector switch (such as
the Standard Manufacturing DP-12), OR that can be fired using a selector switch that allows the
shooter to alternatingly use ammunition from more than one tubular magazine without having to
manually switch the magazine feeding process (such as the UTAS UTS-15), are prohibited. budsgunshop.com/feeds/state_reg/california_restrictions.pdf