590RM 12 GAUGE PUMP ACTION SHOTGUN These 590RM shotguns are the latest additions to Mossberg's magazine-fed tactical lineup. They utilize the first production double-stack magazines made for pump-actions-providing more efficient capacity vs. length than competitive designs. Plus, they combine time-tested Mossberg durability with ground-breaking new features like a rotary safety selector; a compact, ergonomically-designed forend, and an integrated barrel/single piece heat shield combination. FEATURES: 12 Gauge, 2.75" Chamber, 10+1 Capacity Ambidextrous AR-Style Rotary Safety Selector Stock Base/Adapter is compatible with other Grip designs; Ac Mfg: Mossberg