Buy now from the Parker Used Shotguns available at Gander Mountain. Gander Mountain stocks the best in used shotguns, from the 20-gauge Mossberg 500 series to the 12-gauge Charles Daly 300 line to the hunting shotgun of Browning. Choose between over-under and side-by-side double-barrel, classic pump-action, and semi-automatic guns. Buying used means that the camo tactical shotgun you've always wanted to buy can be yours for a cheap. You can pick up a 16-gauge trap shotgun for less and watch as your clay shooting scores rise.