The M-40 light repeating blaster, also known as the "Thunderbolt", was a repeating blaster produced by Merr-Sonn. It was mounted on a bipod and produced powerful red bolts. They were impractical as close-quarter weapons however.
Chalk notably wielded a Thunderbolt as her favorite weapon. They were also carried by the four hooded men sent to kill Darth Vader on Vohai.
In 137 ABY, a version of the Thunderbolt dubbed Mark 7 was produced and were desired by pirates.