HH-4 grenade launchers were support units manufactured by Merr-Sonn Munitions, Inc. in use by certain smugglers working with the Rebel Alliance during the Galactic Civil War. The launchers had a capacity of five grenades, which were set on a timer and were capable of taking out a small Imperial squad.
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- Star Wars Battlefront: Prima Official Game Guide
- Star Wars Battlefront II: Prima Official Game Guide
- The Complete Star Wars Encyclopedia