Bounus Video Review by NutnFancy: Virginia – -(Ammoland.com)- The Mossberg Shockwave is a 12-gauge shotgun (now in 20 gauge, too) with a pistol grip instead of a stock and a 14-inch barrel. It is NOT considered a short-barreled shotgun under the law, however. Member John V. shared his experience with me on firing one: A