I've always thought about spiral knights with Shotguns, and more Automatic guns.
With the shotgun, there would be a spiralknightified type of shotgun that shot everywhere in front of you, but shoots very slowly and you have to stand still every shot.
There would be a more faster shotgun which is a more, older one like a pump action shotgun, such as a winchester pump action, or if you REALLY want to go older, a classic double barreled shotgun.
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The Automatic gun could be like another autogun, but you don't have to hold still this time.
It shoots in a straight line and looks like a spiralknightified gun.
(I ran out of ideas here)
alchymer=swan off shot gun/olympia
auto gun=heavy machine gun
antigua=semi automatic rifle
magnus=magnum/ shot gun
blaster=high power handgun
pulsar=grenade launcher
catalyzer=mine shooter, detonator
Our weapon mimics the mordern ballistic weapons quite well, i don't think we need any more guns.