The Mossberg 590A1 M-LOK is a 12 gauge pump-action shotgun built on the 590A1 platform. Its heavy-walled 20-inch barrel carries a Parkerized finish, and the gun holds eight rounds plus one in the chamber. It takes 3-inch shells, weighs 7 pounds and measures 41 inches overall. XS ghost ring sights and an M-LOK forend give it a practical, duty-oriented configuration, and the fixed black synthetic stock has storage for four shells.

This model fits buyers who want a pump shotgun for defensive, duty or field use, with a metal trigger guard and metal safety button for durability. The cylinder bore accepts 3-inch shells, and the M-LOK forend lets you mount compatible accessories without adding bulk. In Arkansas, any legal shotgun may be used in modern gun season, and the Zone 8 modern gun dates for 2026-27 run November 14 to December 6.

Key features

• 12 gauge pump action, 20-inch heavy-walled barrel
• 8+1 capacity, 3-inch chamber
• Parkerized finish, metal trigger guard
• M-LOK forend, XS ghost ring sights
• Fixed synthetic stock with four-shell storage

This shotgun ships to a licensed Arkansas FFL dealer, where you complete Form 4473 and the NICS check before you take it home.