Selected by the U.S. armed forces after passing the rigors of the MilSpec qualification, the 590A1 is the duty weapon of choice for military and law enforcement agencies worldwide. 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 and metal trigger guards and safety buttons standard on all models. The Magpul series 590A1 features a Magpul SGA adjustable stock, which provides length-of-pull adjustment of nearly four inches with relative ease without the need for additional tools. The included interchangeable cheek risers allow for an even more precise fit. The fluted barrel aids in heat dissipation and the MOE forend allows for a comfortable, secure grip. Picatinny top rail. XS ghost ring rear sight. 9-round tubular magazine. Fixed cylinder bore.