Mossberg 590A1 MIL-SPEC 12 Gauge

The Mossberg 590A1 MIL-SPEC 12 Gauge is a rugged pump-action shotgun built around Mossberg’s heavy-duty 590A1 platform. This model features an 18.5-inch barrel, 3-inch chamber, cylinder bore, Marinecote-style silver finish, black synthetic stock, and M-LOK forend for accessory mounting.

This example appears to be in excellent condition and includes the original Mossberg cardboard box, owner’s manual packet, cable lock, and factory paperwork. The barrel is marked for 2 3/4" and 3" shells, with 12 gauge, 18 1/2-inch cylinder bore markings visible in the photos. The front bead sight, compact 18.5-inch barrel, and durable synthetic furniture make it a practical, hard-use configuration.

The 590A1 is well-suited for home defense, truck/ranch use, range training, and buyers who want a durable pump-action shotgun with proven Mossberg reliability. The Marinecote finish adds corrosion resistance, while the M-LOK forend gives the user flexibility for adding a light or other compatible accessories.

Specs Table