Mossberg 590A1 12 Ga Pump Shotgun – Heavy-Wall 18.5" Barrel, Knoxx SpecOps Recoil-Reducing Stock, Fiber-Optic Sight
This customized Mossberg 590A1 pairs the rugged, mil-spec foundation of the 590A1 platform with a recoil-reducing BlackHawk/Knoxx SpecOps Gen 2 adjustable stock and a high-visibility green fiber-optic front bead. The heavy-wall 18.5-inch barrel, metal trigger guard, and matte Parkerized finish reflect the shotgun’s military lineage, while the clean-out magazine tube and drilled-and-tapped receiver add practical convenience for hard use or duty carry.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent – clean, mirror finish, no signs of wear.
Specific Condition Notes: This shotgun exhibits minor scuffs and handling marks.
What’s Included
- BlackHawk/Knoxx SpecOps Gen 2 recoil-reducing 6-position adjustable stock (installed)
- Mossberg factory fixed synthetic buttstock
The 590A1 is the only pump shotgun platform to pass the U.S. MIL-S-3443E endurance test, and this example retains the heavy-wall barrel, dual action bars, and metal safety components that earned that reputation. The 18.5-inch cylinder-bore barrel is phosphate-finished for corrosion resistance and mates to a clean-out magazine tube for straightforward maintenance.
The installed BlackHawk/Knoxx SpecOps Gen 2 stock offers six length-of-pull settings and an integrated recoil-reduction system, making rapid follow-up shots more controllable with both 2 ¾- and 3-inch shells. A pistol-grip profile and textured surface provide a solid purchase, while the original Mossberg synthetic stock is included for users who prefer a traditional configuration.
An aftermarket green fiber-optic front bead replaces the standard brass bead, giving a brighter aiming point in varied light. The receiver is drilled and tapped, so adding a rail or optic is straightforward. Top-tang safety placement, a ribbed polymer forend, and matte Parkerized grey-black finish round out a package built for reliability and ease of use.