The Mossberg 590 Shockwave SPX is a 12-gauge pump-action with a 14.3-inch barrel classified as a pistol-grip firearm rather than a shotgun under federal law, which affects how it can be purchased and transported. At 26.37 inches overall and 5.75 lbs, it's compact enough for tight spaces. 
 

Key Specifications 

• Brand: Mossberg 
• Model: 590 Shockwave SPX 
• Gauge: 12 GA 
• Action Type: Pump Action 
• Capacity: 5+1 rounds 
• Barrel Length: 14.3 inches 
• Overall Length (OAL): 26.37 inches 
• Weight: 5.75 lbs. 
• Chamber Size: 3 inches 
• Sights Type: Bead Front Sight  
• Stock Material: Synthetic (Black) 
• Receiver Material: Steel with Matte Blued Finish 
   

Detailed Features 

 
The fixed Raptor grip provides control and a consistent hold. The heavy-walled barrel has a heat shield that helps during extended firing. The ambidextrous tang safety works for left or right-handed shooters without any modification. A bead front sight keeps the sight picture uncluttered.

Most owners of the 590 Shockwave SPX focus on its compact form factor as the main draw. For home defense and storage in tight spaces, the short overall length of 26.37 inches is practical and the pump-action is reliable with standard 12-gauge loads.

The build quality gets praise consistent with Mossberg's reputation. Recoil gets mentioned frequently, and it's a real consideration with 12-gauge loads from a platform this light. Less experienced shooters sometimes find it challenging until they develop proper technique.

Legal classification comes up regularly in discussions. The Shockwave is a "firearm" under federal law, not a shotgun, and some jurisdictions have specific rules about ownership or carry. Performance at range is limited compared to a standard-length barrel, which most owners acknowledge is an expected trade-off for the format.