Built to perform where conditions are harsh and reliability is non-negotiable, the Benelli M4 H2O Tactical is a combat-proven semi-automatic shotgun engineered for uncompromising duty use. Trusted by the U.S. Marine Corps for decades, the M4 H2O elevates the platform with a Titanium Cerakote finish that delivers exceptional corrosion resistance, making it ideal for marine, humid, or high-exposure environments.

At the heart of the M4 is Benelli’s Auto-Regulating Gas-Operated (A.R.G.O.) system—a short-stroke, dual-piston design that self-cleans and self-regulates. This system allows the shotgun to cycle a wide range of loads, from lighter field rounds to full-power 3" buckshot, without manual adjustments. The result is consistent performance, reduced maintenance, and rock-solid reliability under stress.

Designed for fast target acquisition and modular setup, the M4 H2O features LPA ghost ring sights with a white dot front blade and an integrated Picatinny rail for optics. The pistol-grip synthetic stock enhances control while helping manage recoil and muzzle rise, keeping follow-up shots fast and precise.

Key Features & Specifications

• Gauge: 12 Gauge

• Action: Semi-Automatic (A.R.G.O. Gas System)

• Chamber: 3"

• Capacity: 5+1

• Barrel Length: 18.5"

• Choke: Modified (M)

• Sights: Ghost Ring rear, white dot front

• Optics Ready: 5.25" Picatinny rail

• Stock: Black synthetic, pistol grip

• Finish: Titanium Cerakote

• Overall Length: 40"

• Length of Pull: 14.4"

• Weight: 7.8 lbs

• Model: Benelli M4 H2O

• Handedness: Right-Handed