Mossberg 590 Shockwave and how it's classified
The Mossberg 590 Shockwave is classified by the ATF as an 'other firearm,' not a short-barreled shotgun, due to its specific design features like a hand strap and bird's head grip. Adding a stock or vertical foregrip would reclassify it as an Any Other Weapon (AOW), requiring a Class 3 license and tax stamp. While currently legal to own, potential future reclassification by the ATF warrants caution.











