The Mossberg 590M Breacher is a pump-action 12 Gauge shotgun built for close-quarters use, pairing a 14.375-inch barrel with a double-stack detachable box magazine holding 10+1 rounds. Overall length is 27 inches, and the shotgun wears a Tungsten finish. Because the barrel measures under 18 inches, this is a short-barreled shotgun configuration; transfer requires additional federal paperwork. 
 

Key Specifications 

• Brand: Mossberg 
• Model: 590M Breacher 
• Caliber: 12 Gauge 
• Action: Pump Action 
• Capacity: 10+1 
• Barrel Length: 14.375 in 
• Overall Length: 27 in 
• Finish: Tungsten 
   

Detailed Features 

• Double-stack detachable box magazine holds 10 rounds ready for quick reloads 
• 2.75-inch chamber accepts standard 12 Gauge shells 
• Compact 14.375-inch barrel and 27-inch overall length suit tight-space handling 
• Tungsten finish distinguishes this Breacher configuration from standard 590M models 
• Pump-action operation keeps the manual of arms simple and reliable

Owners of the Mossberg 590M line generally trust its reliability, and the Breacher configuration carries that reputation into a shorter, more maneuverable package. The pump action is known for running with a wide range of shell types without complaint, which is why these shotguns show up often in home-defense and training roles.

Ergonomically, the compact length and detachable magazine make the Breacher easy to handle in tight spaces, though some shooters note that the shorter length increases felt recoil compared to a standard-length 590M. The double-stack magazine speeds up reloading over a tube-fed shotgun, which owners appreciate for defensive use.

On value, the 590M platform benefits from Mossberg's long production history, so parts and accessories are widely available. Some buyers weigh the cost of the detachable-magazine Breacher variant against a standard tube-fed 590 and decide based on whether the added capacity and compact size justify the price difference.