Black Aces Tactical makes standard and custom Mosseberg Shockwave Shotguns. They have multiple accessories and can customize the Shockwave.
The Short Barrel Scabbard was designed for the lever-action Mares Leg weapons systems like the Rossi Ranch Hand, Puma 92 Bounty Hunter, Henry Mares leg and short barrel shotguns (Mossberg 590 Shockwave, Remington 870 T-14…etc)
If you are looking for the best way to carry your Black Aces Shockwave check out the Beez Combat Systems Short Barrel Scabbard GRID.