Description
Configured for straightforward shotgun handling, the Mossberg 590A1 is a 12 Gauge pump-action shotgun with a 20-inch heavy-walled barrel. It accepts shells with a 3-inch chamber and uses XS Ghost Ring sights with AR-style sights listed among its features. The fixed black synthetic stock includes storage for four shells, while the forend uses M-LOK mounting slots.
Key Specifications
- The shotgun is chambered for 12 Gauge ammunition, a common format for shotgun practice and field use.
- The pump-action operating system provides a manually cycled design for familiar shotgun handling.
- The heavy-walled barrel measures 20 inches, giving this configuration a full-length shotgun layout.
- The chamber accommodates shells up to 3 inches in length.
- The barrel uses a cylinder bore choke configuration.
- The sighting system consists of XS Ghost Ring sights with AR-style sights listed among the features.
- The fixed stock is made from black synthetic material and includes a four-shell storage compartment.
- The forend has an M-LOK mounting interface for compatible accessories.
- An ambidextrous top tang safety places the safety control on the receiver’s upper tang.
- The shotgun includes a metal trigger guard and safety, along with a recoil pad and swivel studs.
We stock this configuration for the practical combination of a heavy-walled barrel, fixed synthetic furniture, and integrated shell storage. The cylinder bore and Ghost Ring sight setup keep the configuration focused and easy to understand, while the M-LOK forend provides an attachment interface without changing the basic pump-action layout. The 13.87-inch length of pull and right-hand configuration are also listed for this model. The Mossberg 590A1 remains the product itself.




