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The 590A1 has earned its reputation the hard way, serving with every branch of the US military and countless law enforcement agencies around the world. What sets it apart from a standard 590 is the beefed-up construction: a heavy-walled barrel, metal trigger guard and safety button instead of polymer, and a Parkerized finish that shrugs off rough handling. This gun meets MIL-SPEC 3443G, which is a fancy way of saying it was built to pass torture tests most shotguns never see.
This particular model (50799) brings the classic 590A1 toughness up to date. The 18.5 inch heavy-walled barrel is threaded for Mossberg's Accu-Choke system and ships with a Cylinder Bore choke installed, so you can pattern different loads or swap chokes as your needs change. The receiver is drilled and tapped and comes optic-ready with a Shield RMSc footprint cut, cover plate installed, letting you mount a compact red dot low and centered without hunting for an adapter plate. Up front, the M-LOK compatible forend gives you slots on the sides and bottom for a weapon light or hand stop. The black synthetic stock includes a spacer system for adjusting length of pull between 12 and 13 inches, which makes it easy to fit smaller-framed family members or shooters wearing body armor.
All the features that make the 590 platform so trusted are here: dual extractors, twin action bars, steel-to-steel lockup, an anti-jam elevator, and the tang-mounted ambidextrous safety that works the same whether you shoot righty or lefty. The clean-out magazine tube makes maintenance simple, and the 3 inch chamber handles everything from light target loads to full-power magnum buckshot. With 6+1 capacity and a handy 37.75 inch overall length, this is a manageable, hard-wearing 12 gauge that will still be running long after you've lost count of the rounds through it. If you want one shotgun for home defense that can take a beating and accept modern accessories, this is a strong place to land.
The receiver on this model is cut for the Shield RMSc footprint, one of the most common micro red dot patterns out there. That covers optics like the Shield RMSc, Holosun 407K/507K, Sig Romeo Zero, and similar compact dots. The receiver is also drilled and tapped, so you can run a traditional rail and larger optic if you prefer. A cover plate comes installed to protect the cut until you're ready to mount something.
The 590A1 is the heavy-duty version built to military specifications. It swaps the polymer trigger guard and safety for metal parts, uses a thicker heavy-walled barrel, and wears a Parkerized finish. It's the configuration that has served with US military branches and police agencies worldwide, so you're getting the most rugged build in the Mossberg pump lineup.
Yes, and that's one of the standout features of this model. The 18.5 inch heavy-walled barrel is threaded for Mossberg's Accu-Choke system and ships with a Cylinder Bore choke installed. That means you can tighten up your patterns with different chokes for specific loads, something most defensive shotguns with fixed cylinder bores can't do.
The 3 inch chamber lets you run everything from light 2 3/4 inch birdshot and target loads up to full-power 3 inch magnum buckshot and slugs. Being a pump action, it will cycle reduced-recoil defensive loads reliably too, which finicky semi-autos sometimes struggle with. The Cylinder Bore choke works well with buckshot and most rifled slugs.
| UPC | 015813507998 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 50799 |
| Action | |
| Barrel Length | 18.5" |
| Caliber/Gauge | 12 Gauge |
| Capacity | 6 + 1 |
| Chokes Included | Cylinder |
| Shipping Weight | 8.9 |
| Sights | Bead Front |
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