The 14" barrel seems to be legal with a Mossberg 500A PGO. I'm no Lawyer, but as long as the firearm left the factory PGO it is not considered a shotgun by BATFE [TITLE 18 921. Definitions (5) : The term "shotgun" means a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder and designed or redesigned and made or remade to use the energy of an explosive to fire through a smooth bore either a number of ball shot or a single projectile for each single pull of the trigger]. If its not a shotgun, barrel length shouldn't apply- (PGO isn't fired from the shoulder). Further, it shouldn't be classified as "Any Other Weapon" because, with the raptor grip its length exceeds 26".
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