At the heart of the Benelli M2-G1 is the innovative Rear Piston Operated (R.P.O.) gas system, engineered to deliver cleaner operation, enhanced reliability, and long-lasting performance. Unlike traditional gas-operated shotguns that position the operating system at the front of the magazine tube—where the valves and recoil spring are exposed to fouling, carbon buildup, moisture, and debris—the R.P.O. system is located closer to the receiver. By collecting gas nearer the chamber, where pressure is stronger and combustion gases are cleaner, the M2-G1 cycles more efficiently while reducing fouling and maintenance. The result is a gas-operated tactical shotgun designed for smoother operation, greater durability, and consistent performance when it matters most.

The Benelli M2-G1 is engineered with an isolated recoil spring housed in the stock, keeping it separated from carbon fouling, moisture, and debris that can compromise performance in traditional gas-operated shotguns. By removing the recoil system from the operating gases, the M2-G1 delivers cleaner cycling, increased reliability, and longer service life with less maintenance.

Combined with the innovative dual-piston Rear Piston Operated (R.P.O.) system, the M2-G1 features fewer moving parts than many competing gas-operated platforms, reducing complexity while enhancing durability and consistency. The result is a cleaner-running, longer-lasting tactical shotgun built to perform under demanding conditions.

In the end…it runs and runs hard. 

How the Benelli M2-G1 R.P.O. System Compares

The comparison below highlights the key operating system characteristics found across today's leading tactical shotguns. While each platform is designed to cycle reliably, the location of the gas system, recoil spring, and operating components has a significant impact on cleanliness, maintenance, and long-term performance.

The Benelli M4's Auto-Regulating Gas-Operated (A.R.G.O.) system remains the combat-proven benchmark within the Benelli tactical lineup, trusted worldwide for its durability and reliability under extreme conditions.

The Benelli M2-G1 introduces the innovative Rear Piston Operated (R.P.O.) system, engineered to occupy a unique position in the tactical shotgun market. Drawing on proven Benelli engineering, the R.P.O. system incorporates rearward gas collection, dual self-regulating pistons, and an isolated recoil spring housed in the stock. By collecting gas closer to the chamber—where pressure is greater and combustion gases are cleaner—the system operates in a cleaner environment than traditional forward-mounted gas systems.

As the comparison illustrates, the M2-G1's R.P.O. system reduces fouling exposure, separates critical operating components from heat and debris, and minimizes maintenance without sacrificing reliability. The result is a cleaner-running, gas-operated tactical shotgun designed for smoother cycling, greater durability, and consistent performance through extended shooting sessions.

Whether on the range or in demanding tactical applications, the Benelli M2-G1 delivers the advantages of advanced engineering in a platform built for lasting reliability and sustained performance.