The DLT-19 was not as popular or as well-known as the standard-issue E-11 blaster rifle, because it took longer to assemble and load. However the DLT-19 was much more powerful and had a much greater range than the E-11 model. The E-11s sniper rifle bore a striking resemblance to this weapon with the addition of a scope. In this configuration it could shoot down swoops, or even light airspeeders.
It was commonly carried by Imperial stormtroopers and army troopers although the bounty hunter4-LOM was also known to use the weapon. Imperial security details often used the rifle because of its long-range capabilities. It was these capabilities that made it a common sight on Imperial controlled planets with large, clear, open areas, like Tatooine. Chewbacca used a stolen one during the Rescue on Death Star I.
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The DLT-19 was based on the real-world MG34 machine gun from Germany. The DLT has been painted solid black with added "rails" on the barrel shroud similar to the E-11 blaster.