The MPL-57 (Multi-Purpose Launcher) was a grenade launcher originally developed by Merr-Sonn Munitions, Inc. during the Galactic Civil War in an effort to widen its market share. It proved popular for its versatility and capability for firing a wide variety of ammunition, and was utilized both by soldiers of the Alliance to Restore the Republic and by stormtroopers of the Galactic Empire. The launcher could fire three grenades with a short delay fuse in rapid succession, making it useful for infantry engagements.
In addition to its use as a grenade launcher, there were two common modifications of the MPL-57 used during the Galactic Civil War. The first variation refitted the launcher to fire ion torpedoes, and had the leaf sight replaced with an electronic targeting scope to lock on to vehicle targets and stationary weapons. The second variation refitted the launcher to fire homing missiles and added a targeting scope that would lock on to organic signatures, such as enemy soldiers.