The DLT-19 heavy blaster rifle was a weapon produced by BlasTech Industries

BlasTech Industries Organization Manufacturers

that saw use during the time of the Galactic Empire.
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.
The blaster had several modifications, including a modified flash suppressor, alternative stock and placement of sight elements.