The T-21's design was in-part inspired by the DC-15A blaster rifle of the Galactic Republic's clone troopers. Magma troopers and shadow troopers were known to use the T-21. Shortly prior to the Battle of Yavin, a number of the stormtroopers deployed to the planet Tatooine to search for a set of stolen Death Star plans carried T-21s. A marksman version with optics, the T-21B heavy blaster, was modeled after the T-21 design.
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