Gauge: 12 ga., 3”. Barrel: 18.5”. Weight: 7.8 lbs. Length: 40” overall. Stock: Synthetic. Sights: Ghost ring rear, fixed blade front. Features: Auto-regulating gas-operated (ARGO) action, choke tube, Picatinny rail, standard and collapsible stocks available, optional LE tactical gun case. Introduced 2006. M4 EXT debuted 2026 with higher capacity, five-position collapsible stock, integrated pistol grip, and Picatinny optics rail (add 30%). Add 13% for the H20 variant.