The Mossberg 500 ATI Scorpion is a pump-action 12-gauge shotgun in black and flat dark earth finish. It has an 18.5-inch barrel, 3-inch chamber, 5+1 capacity, and weighs 6.75 lbs at 36.375 inches overall. 
 

Key Specifications 

• Manufacturer: Mossberg 
• Model: 500 ATI Scorpion 
• Action: Pump Action 
• Caliber: 12 Gauge 
• Chamber Size: 3" 
• Barrel Length: 18.5" 
• Overall Length: 36.375" 
• Capacity: 6 rounds (5+1) 
• Weight: 6.75 lbs (108 oz) 
• Finish Color Options: Black / Flat Dark Earth 
   

Detailed Features 

 
The collapsible ATI Scorpion stock adjusts length of pull from 10.75" to 14.625", which accommodates a wide range of body sizes without tools. The synthetic grip holds up in wet conditions. Sighting is handled by a winged post front sight and bead sight. A Picatinny rail on the receiver accepts optics or lights. The Halo heat shield protects against heat buildup during extended firing. Recoil is managed through the stock's design, which helps with follow-up shots. 
 

Usage 

 
The 18.5-inch barrel and compact collapsed length make the 500 ATI Scorpion practical for home defense use, where maneuverability in tight spaces matters. The 5+1 capacity is standard for this class of defensive shotgun. The Mossberg 500 platform has extensive aftermarket support, so accessories and upgrades are widely available. The shotgun also works for sport shooting and training, though its weight and 12-gauge recoil are factors in extended sessions.

The Mossberg 500 ATI Scorpion draws on the well-established 500 platform's reputation for reliability, and that carries through in user feedback.

Reliability is the top talking point -- the Mossberg 500 action has a long track record, and owners of this variant report consistent cycling without notable issues. The ATI Scorpion stock gets specific positive attention for its ergonomics and adjustability, which makes the gun fit different shooters without modification. The FDE finish is liked for its appearance, and several users mention it looks good in outdoor environments.

Weight comes up as a mixed point. At 6.75 lbs it's not light, but most users find it manageable. A few users who plan to use it for prolonged carry or extended training sessions wish it was lighter.

The aftermarket for the Mossberg 500 platform is one of the most active in the shotgun category, and owners frequently discuss accessory options. This is consistently framed as an advantage.

Value is generally positive -- users tend to see this as a solid return on investment compared to other tactical pump shotguns at similar price points. New users occasionally mention a learning curve with setting up and adjusting the stock out of the box.