This Laser Sniper gets manufactured by the Imperial Antian Weapon Factory and is the official Sniper Rifle of the Imperial Antian Army. The 53 stands for the year of development (antian calendar) and the 3 for the version.
The heavy crystal magazine contain shots for 1.000 low energy shots or 300 high energy shots. The cooling cartridges are placed behind the grip, usually the soldier needs many of them, because of the high heat development. Since the second version, there are two cooling cartridges for a better combat experience.

The member of the Specialcommando Schneider, Kaleria Zerkius, us a modified version of this rifle.

Art by Art by  HigthNekoHNZ