Mossberg 50799 590A1 12 Gauge Pump 3" 6+1 18.50" Black Parkerized Heavy Walled Barrel, M-LOK Forend, Black Parkerized Steel Drilled & Tapped Receiver, Fixed Black Synthetic Stock, Cylinder Bore Choke

The Mossberg 590A1 is a 12-gauge pump-action shotgun built on a platform proven through decades of military and law enforcement service worldwide. This particular 50799 model pairs that battle-tested reliability with a compact 18.50-inch barrel and 3-inch chamber, making it a natural fit for home defense, tactical applications, or anyone who wants a shotgun that won't quit. The heavy-walled parkerized barrel and steel receiver are engineered to handle serious use, while the 6+1 capacity gives you genuine stopping power on tap.

What sets this 590A1 apart is the thoughtful blend of modern ergonomics and proven mechanics. The M-LOK compatible forend gives you clean, modular mounting for lights, slings, or other accessories without the bulk of traditional rail systems. The drilled and tapped receiver means you can add optics if your mission demands it—the gun is set up for Shield RMSc footprint mounts. The fixed synthetic stock with adjustable length of pull (12–13 inches) balances comfort with durability, and the parkerized finish on both barrel and receiver is corrosion-resistant and low-maintenance. You get cylinder bore choke right out of the box, with access to Accu-Choke barrel options down the road if you want to diversify your load profiles.

Under the hood, the 590A1 runs twin action bars, steel-to-steel lockup, dual extractors, and an anti-jam elevator—features borrowed directly from military specs. The top-mounted ambidextrous safety and metal trigger guard are designed for durability and gloved operation. Whether you're building a home defense battery, setting up a truck gun, or just want a pump-action 12-gauge that will never leave you stranded, the Mossberg 590A1 delivers no-nonsense performance at a realistic price point.

Key Features

• Heavy-walled parkerized barrel and steel receiver for durability and corrosion resistance
• M-LOK compatible forend with accessory mounting slots for modern add-ons
• Drilled and tapped receiver with Shield RMSc footprint for optic integration
• Twin action bars and steel-to-steel lockup for reliable cycling under stress
• Dual extractors and anti-jam elevator for dependable operation
• Top-mounted ambidextrous safety for both-hands operation and gloved use
• Metal trigger guard and safety for longevity
• Adjustable length of pull (12–13 inches) on fixed synthetic stock
• 6+1 capacity with clean-out magazine tube
• Cylinder bore choke installed; compatible with Accu-Choke barrels
• Front bead sight included

Specifications

Frequently Asked Questions

Is the Mossberg 590A1 suitable for home defense?

Yes. The 590A1's compact 18.50-inch barrel, manageable length, and proven reliability make it a solid home defense choice. The adjustable length of pull ensures a proper fit for different shooters, and the 6+1 capacity gives you adequate rounds without excess bulk in tight spaces.

Can I add a tactical light or other accessories to this shotgun?

Absolutely. The M-LOK compatible forend features mounting slots for lights, slings, and other modern tactical gear. The drilled and tapped receiver also allows you to mount optics using the Shield RMSc footprint if you want to add a red dot or other sight.

What choke comes installed, and can I change it?

This 590A1 ships with a Cylinder Bore choke installed. The gun is compatible with the Accu-Choke system, so you can swap barrels or use different chokes for different loads and applications if needed in the future.

What does the drilled and tapped receiver mean?

It means the top of the receiver has pre-drilled and tapped holes ready to accept a mounting base or optic adapter. In this case, it's set up for Shield RMSc footprint optics, so adding a compatible red dot or sight is straightforward.