This is the Mossberg 590S Magpul-Holosun Micro Dot Combo (51606), a 12-gauge pump shotgun with a factory-mounted Holosun HS407K micro dot (6 MOA dot, 12 brightness settings, Shake Awake). The receiver is cut for direct mounting of micro dots (Shield RMSc footprint). The 590S system cycles 1.75", 2.75", and 3" shells in any combination without a mini-shell adapter, thanks to a redesigned elevator, bolt slide, and energy-absorbing bumper. Capacity is 5+1 with 3" shells, 6+1 with 2.75" shells, and 9+1 with 1.75" shells. It has an 18.5" matte blue Cylinder Bore barrel with a bead front sight. The gray Magpul SGA stock adjusts with spacers for a 12.25"-14.25" length of pull, and the gray Magpul MOE M-LOK forend has front and rear hand stops; both have QD sling mounts. Standard Mossberg 590 features include dual extractors, twin action bars, steel-to-steel lockup, an anti-jam elevator, a top-mounted ambidextrous safety, and a clean-out magazine tube cap. Mossberg lists 38" overall length and 6.75 lb.

In stock at Custom Defense Solutions USA in Littleton, MA.

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