DE-10

DE-10 heavy blaster pistols were used since the end of the Clone Wars and were possibly experimental blasters for clone troopers. Since then, they have been found in the hands of Mandalorian Death Watch mercenaries.
Utilizing a detachable scope, it fires a blue blaster bolt and even has an overcharge shot although it is usually not recommended as it can overheat and even melt the blaster. A "Magnum" model that is slightly heavier and bigger than the original designs is also in circulation.
Max-Tex was known to use blasters like these in his early career as a bounty hunter.