Yes, to the DemoCRAPS it is probably considered to be a "heavy sniper rifle" if it weighs any more than a Daisy BB gun.
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Take a look at that "rifle"...it has two fixed mounts, so basically, a target must stop in the exact line of sight to be hit. A formidable weapon indeed. BTW, what is the baseline "calibre" upon which the "three times the size" was based?
doesn't that nagent have a 30 round magazine clip in 23mm caliber?