Gauges: 12-ga., 3”. Barrels: 20”, 18.5”, and 14” (Cyl. heavy-walled). Weight: 7 lbs. Introduced 2025. Enhanced assembly and quality control process with special finishes and features, including a refined loading port to help optimize performance. Other features: Ghost ring and front fiber-optic sights equipped with protective low-profile wings. Adapter plates provided for optics-ready receiver for mounting RMR, Docter, and Leupold footprints. Two stock options with spacer systems for customization. Magpul SGA variable length-of-pull (LOP) stock adjusts in .5” increments from 12.25”-14.25”. Compact stock features a one-inch insert for adjustment from 12”-13”. Enlarged ambidextrous safety. Mossberg is offering nine versions of the 590A1 in its Professional Series, including nine- and seven-shot versions with the option of Cerakote or Marinecote metal finishes; Compact stocks and Magpul-equipped models; a six-shot NFA/Class 3 offering; and options with orange furniture. Drilled and tapped receiver.