You could but because of the simple bead front sight your range will be very limited. To get a shotgun with a standard bird barrel to reach out a bit further you will have to either get a set of clip on sights or a scope and mount. Just save up a few more bucks and buy a remington or mossberg combo gun.
In the long run you will save money. With add on sights or a scope you will have to resight the gun whenever you switch from bird mode to hog mode and lead free slug loads aren't cheap. If you get a gun with two barrels you just swap them and you're ready to hunt. Scince you live in the bay area I assume you'll be hunting in the lead free zone so you wont be able to shoot the old style lead rifled slugs which are meant to be used with a smooth bore. A rifled barrel will work alot better for the lead free sabot ammo you'll have to use over there.