Which weapon is designed not to cook off?

Which weapon is designed not to cook off?

• A. M2
• B. 240B
• C. MK19
• D. M60

Answer: (C)

Cook-off happens when a chambered cartridge ignites from heat rather than a firing pin strike. Open-bolt designs vent the chamber to air between shots, cooling it and reducing the chance of a heat-induced discharge. The MK19 grenade launcher operates from an open-bolt, belt-fed system, so the chamber stays exposed to cooling air between shots. That design feature makes it less prone to cook-off under sustained fire compared to the other weapons listed, which do not rely on this open-bolt cooling method.

Cook-off happens when a chambered cartridge ignites from heat rather than a firing pin strike. Open-bolt designs vent the chamber to air between shots, cooling it and reducing the chance of a heat-induced discharge. The MK19 grenade launcher operates from an open-bolt, belt-fed system, so the chamber stays exposed to cooling air between shots. That design feature makes it less prone to cook-off under sustained fire compared to the other weapons listed, which do not rely on this open-bolt cooling method.