MK-19 Grenade Launcher is not interchangeable with the M203, uses 40mm grenades, and has a 2,200-meter range.

• A. M203 Grenade Launcher
• B. M29A1 Mortar
• C. MK-19 Grenade Launcher
• D. MK-46 Grenade Launcher

Answer: (C)

Focus on distinguishing grenade launchers by how they feed rounds, how they’re mounted, and their typical range. The MK-19 is a belt-fed, automatic 40mm grenade launcher designed for vehicle or ship mounts, and it can reach about 2,200 meters with standard 40mm grenades. It isn’t interchangeable with the M203 because the M203 is a rifle-mounted, single-shot under-barrel launcher with a much shorter effective range. The M29A1 Mortar is an 81mm mortar, not a 40mm launcher, while the MK-46 is a different 40mm launcher used in other platforms with different handling and range. So, the description aligns best with the MK-19 Grenade Launcher.