The Merr-Sonn

Merr-Sonn Munitions, Inc. Organization Manufacturers

Model 57 blaster pistol was a weapon similar in appearance to the BlasTech DL-44 heavy blaster pistol.
The Rebel Alliance purchased a number of these weapons from an arms dealer on Ord Mantell

Ord Mantell Planet

. One of them came into the possession of Luke Skywalker

Luke Skywalker (Human) Character Major Characters

, who used it as his personal weapon alongside his lightsaber.