The M2HB (50 cal) is a what?

• A. Water cooled, gas operated
• B. Air cooled, gas operated
• C. Air cooled, recoil operated weapon
• D. Liquid cooled, recoil operated

Answer: (C)

The M2HB is driven by a recoil-operated mechanism, meaning the barrel and bolt lock together and recoil a short distance after firing, then unlock to extract and chamber the next round. It’s designed as a heavy-barrel, air-cooled weapon, with no water jacket or liquid cooling required. The heavy barrel helps manage heat, and cooling is achieved through air flow rather than water cooling. This combination distinguishes it from gas-operated or water-cooled variants, making it the air-cooled, recoil-operated type.