575.00 Mossberg 590 Shockwave 12 ga Winnipeg Oct 1, 2024 - 8:49 AM hermn8r Dealer Selling/trading a Mossberg 590 Shockwave 12 gauge. Overall it's in nice shape. 18.5" barrel, 3" shells, fixed cylinder choke. Steel is in good shape, shows some surface marks and scuffs throughout. Bore is in nice shape.