These Mossberg 590A1s are built to demanding military and law enforcement specs. Now civilians can get the same rock-solid 590A1 shotguns that have proven themselves in duty applications worldwide for decades. 590A1 models are built for the most demanding on-duty conditions with Parkerized heavy-walled barrels metal trigger guards and safety buttons standard on all models. Inside they feature dual extractors twin action bars positive steel-to-steel lock-up and an anti-jam elevator combined for reliable smooth operation. Offered in 12 gauge the 590A1 chambers 2.75 and 3 factory shotshells. All receivers are drilled and tapped ready for Picatinny rail sight or optics installation. This Retrograde model features a heavey-walled barrel with a heatshield ghost ring sights and a walnut stock.