The M203 Grenade Launcher is a 40mm underbarrel grenade launcher used by the US military and other military forces as an attachment to the M16 Rifle and M4 Carbine. The weapon can be attached to other weapons with the proper adapter. The M203 was designed in the 1960s as a replacement for the M79 Grenade Launcher. The M203's main advantage over the M79 is that it is mounted under the M16, allowing the user to carry both the M203 and the M16, whereas as a grenadier armed with an M79 could carry only a pistol and a combat knife. While the M203 has supplanted the M79 in some roles, the M79 is still used in some role as the M79 has a longer range. The M320 will eventually replace the older M203.


  • American M203A1
  • Canadian M203A1
  • M203A2
  • M203PI
  • M203 DAX
Community content is available under CC-BY-SA unless otherwise noted.