The M320 Grenade Launcher (GL) is the replacement to all M203 series of grenade launchers on M16 Rifles and M4 Carbines. A modular system, it attaches under the barrel of the rifle or carbine and can convert to a stand-alone weapon. The M320 has an available day/night sighting system and improved safety features. It also has a side-loading unrestricted breech that allows the system to fire longer 40mm low-velocity projectiles (NATO standard and non-standard).
The platform’s available sighting system allows Soldiers to accurately target in daytime or nighttime, while reducing aiming error and increasing first-round hit probability. Located on the side of the launcher, the sighting system design lessens interference with rifle and carbine sights, reduces attaching operations to one action, and eliminates the need to re-zero after reattaching to a weapon. The system also comes with an integrated leaf sight.
The M320 is more reliable and safer because it uses a more modern double-action trigger/firing system. If the weapon misfires, the operator can pull the trigger again, compared with the M203, which requires cycling of the breech to re-cock the firing pin and pulling the trigger again.
The new pistol grip design eliminates the need to use the magazine as a hand grip. The latest in lightweight material composites are used to improve durability.