The M203 is a single-shot 40 mm under-barrel grenade launcher designed to attach to a rifle. It uses the same rounds as the older stand-alone M79 break-action grenade launcher, which utilizes the high-low propulsion system to keep recoil forces low.

The M203 is a 40mm single-shot grenade launcher designed for use with the M16, the M203A1 is used with the M4, and the M203A2 is the current modification that provides a mounting system...

May 3, 2022 · The M203 is a well-known single-shot 40mm under-barrel grenade launcher designed to attach to the rifle. It has become the first weapon of this type to achieve operational service inside the US military.

A US Special Forces soldier armed with a M4A1 Carbine, fitted with an underslung M203 40mm grenade launcher, aimed with a M68 Close Combat Optic red dot sight. This M4A1 also has a AN-PEQ2 and a flash-light fitted to the Rail Interface System (RIS).

U.S. Army Ranger armed with a M4A1 carbine, fitted with an underslung M203 40mm grenade launcher. Note the shortened shotgun strapped to the Ranger's thigh. Shotguns are often loaded with breaching rounds that are used to shoot the locks and hinges off doors.

Jul 1, 2006 · This troop in Iraq is equipped with an M4 carbine, M203 grenade launcher, Trijicon ACOG Optical sight, Knight’s Armament Company RAS (Rail Adapter System) flashlight and a AN/PEQ 2 infrared illuminator.

Doing some *bloops* using the LMT M203 40MM Grenade Launcher with some training chalk rounds and .22LR Hornets Nest adaptor attached to an M4A1 Block II. Ton...

A Force Reconnaissance Marine takes aim with a M203A1 attached to a M4A1 carbine. Note the flip-up 'leaf' sight mounted atop the M4A1's RIS rail. The leaf sight features elevation and windage scales while the front sight post on the M4A1 doubles as the M203's front sight post.

The M4A1 excels in Close Quarters Battle and Counterterrorist operations. It fires a high-velocity 5.56mm round, essential when taking on terrorists wearing body armor or bullet-proof vests. This rifle can also be quickly and easily converted to a grenade launcher or shotgun.

May 2, 2023 · The M4A1 features an ambidextrous fire control switch with three settings. Instead of safe, semiautomatic, and three-round bursts, the M4A1 replaces the three-round burst with full-auto. Depending on specific conditions, the rate of fire …