Attached
Since grenade launchers require relatively low internal pressure and only a short barrel, a lightweight launcher can be mounted under the barrel of a traditional rifle. This reduces the weight the soldier must carry by eliminating the grenade launcher's buttstock and makes the grenade launcher available for use at a moment's notice.
Underbarrel tubes generally have their own trigger group; to fire, one simply changes grips, disengages the safety, and pulls the trigger. In Western systems, the barrel slides forward or pivots to the side to allow reloading. Soviet/Russian launchers are instead loaded from the muzzle, with the cartridge casing affixed to the projectile in the style of a mortar shell. For aiming, attached grenade launchers typically use a separate sight attached to the rifle's frame alongside the iron sights, or attach a flip-up sight directly to one of the rifle's sights.
Examples of modern attached grenade launchers are the M203, GP-30, AG36, and FN40GL which mount to service rifles.
A late development is the 3GL from Metal Storm. As with most Metal Storm products, this weapon contains three electrically ignited grenades stacked front-to-back in a single tube to eliminate reloading.
Read more about this topic: Grenade Launcher
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