The Mossberg 590R Stand-Off is a pump-action shotgun chambered in 12 gauge with an 18.5-inch breacher barrel and a 3-inch chamber. It holds 6+1 rounds and ships with a Picatinny rail for optic mounting. The adjustable stock and matte blue finish complete a tactical configuration intended for close-quarters use. 
 

Key Specifications 

• Brand: Mossberg 
• Model: 590R Stand-Off 
• Caliber: 12 Gauge 
• Action: Pump Action 
• Barrel Length: 18.5 in 
• Capacity: 6+1 
• Color/Finish: Black 
   

Detailed Features 

• 18.5-inch breacher barrel 
• 3-inch chamber 
• Picatinny rail for optic-ready mounting 
• Adjustable stock 
• Flat profile trigger 
• Matte blue finish

Owners of the Mossberg 590R Stand-Off appreciate the breacher barrel as a practical addition to an 18.5-inch defensive shotgun. The Picatinny rail is a common upgrade target for a red dot, and most report the optic-ready cut works with compact reflex sights without issue.

The pump action on the 590R is generally praised for its smooth cycling, which is consistent with the broader 590 platform reputation. The adjustable stock gets positive remarks from shooters fitting the gun to different users or configurations, though some find the proprietary stock interface limits aftermarket options.

The flat profile trigger is a detail that draws attention in reviews. Opinions are divided on whether it improves the feel over a standard trigger shoe. At the 590R Stand-Off price point, buyers frequently note that Mossberg's build quality is solid and the platform has proven durability in heavy-use settings.