U.S.M.C. Approved 
This piston-driven Auto-Regulating Gas-Operated (A.R.G.O.) system was designed for and approved by the U.S. Marine Corps.

Benelli’s patented Auto-Regulating Gas-Operated (A.R.G.O.) system is a simple, self-cleaning, piston-driven action.

• Auto-Regulating Gas-Operated
  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. It was later adopted as the U.S. Joint Services combat shotgun—and remains so today.
  • The gas port is located just forward of the chamber, where the gases are hotter and cleaner. This results in less fouling and more reliable cycling.
  • Pistons push directly against the bolt, for fast operation and minimum vibration.
  • There are no connecting linkages or heavy action bars under the forend, which add weight.
    
    
• Standard Features
  • Standard Choke Tubes
    Standard choke tube M.
    
    
  • Ghost-Ring Sights
    
    
  • Drilled and Tapped Receiver