Benelli M4 H2O Tactical Titanium Cerakote 12 Gauge 3in Semi Automatic Shotgun - 18.5in - The Benelli M4 Tactical is a reliable shotgun upon which the U.S. Marine Corps depend and trust. The M4 Tactical comes standard with a Picatinny rail and pistol-grip stock. Other features include a windage-adjustable front sight and a fully-adjustable ghost-ring aperture rear sight. What distinguishes Benelli from the competition is the ultra-reliability and quality built into ever gun based on superior performance and craftsmanship.