Interesting Engineering on Instagram: "The evolution of grenade launchers has reached new heights with the development of the M203 and MK19. The M203, a single-shot 40mm under-barrel launcher, and the MK19, a fully automatic 40mm grenade machine gun, have revolutionized infantry capabilities. Via @militarymechanicsie"

Colt MK18 Mod 1 with M203 – Compact Carbine and Grenade Launcher Explained | Tactical Rifle Overview