Benelli M4 Tactical Olive Drab Green 12 Gauge 2-3/4in Semi Automatic Shotgun – Benelli’s patented Auto-Regulating Gas-Operated (A.R.G.O.) system is a simple, self-cleaning, piston-driven action. The A.R.G.O system is a unique, short-stroke, dual-piston design developed for the M4 Tactical shotgun in 1998 for the U.S. Marine Corps.
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