The Mossberg 590M Shockwave is a 12-gauge pump-action firearm with a 15-inch heavy-walled barrel. It is classified as a "firearm" rather than a shotgun due to its overall length and pistol-grip configuration, which affects how it is regulated in some jurisdictions. Capacity is 10+1 rounds from a removable box magazine. Weight is 6.5 lbs. The Raptor grip is synthetic. Finish is matte blued/black. An ambidextrous tang safety is standard. 
 

Key Specifications 

• Brand: Mossberg 
• Model: 590M Shockwave 
• Gauge: 12 GA 
• Action: Pump Action 
• Capacity: 10+1 rounds 
• Barrel Length: 15 inches (Heavy-Walled) 
• Weight: 6.5 lbs. 
• Finish: Matte Blued/Black 
   

Features 

 
The 590M designation means this uses the detachable box magazine system rather than a tube magazine, which is the distinctive feature relative to other Shockwave variants. Swapping magazines is faster than tube-loading, and higher-capacity magazines are available. The 15-inch barrel is short by design; the heavy-wall construction compensates for structural rigidity. The Raptor grip is designed for control without a traditional stock. The tang safety is easy to reach from either hand. 
 

Legal Note 

 
The Shockwave is legal for purchase in most states without additional NFA registration, but its classification as a "firearm" rather than a shotgun means state-level regulations vary. Buyers should verify local laws before purchasing. 
 

Usage 

 
The main appeal is a very compact 12-gauge platform with a 10+1 magazine capacity. The trade-off is that the pistol-grip-only configuration makes it harder to shoot accurately at distance compared to a stocked shotgun. This is a close-range tool.

Owners appreciate the compact size and the 10+1 magazine capacity from a detachable box. The pump action is considered reliable and the removable magazine for fast reloads is a genuine improvement over tube-fed Shockwave variants.

Recoil is the most common friction point. A 12-gauge in a pistol-grip-only configuration without a stock transfers more felt recoil to the hands and wrists than a traditional shotgun -- most users adapt, but it is a real consideration, particularly for lighter or less experienced shooters.

The legal classification discussion comes up frequently. Some buyers appreciate that it falls outside NFA regulation in most states; others note that the resulting design tradeoffs limit practical accuracy at any real distance. Aftermarket accessories -- lights, optic mounts, grip modifications -- are popular. Price is generally regarded as fair for the category.