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)