Translation

I ran a machine translation of rapid-fire plasma canon (for the NSL 
Panzergren with the RF plasma SAW) and got:

Schnellfeuer Plasmakanon

SfPk (or SFPK)

So, to someone who speaks German as a native language (or at least 
enough to tell good from bad translation), is this a case where the 
literal translation works or fails? 

I have other options

Plasmaangriff Kanone (plasma assault cannon)
PlasmaSturmKanone (plasma storm cannon)
automatischer Plasmakanon (automatic plasma cannon)

And am open to other suggestions. Thoughts? 

And Dank im voraus für Ihre Hilfe :) 

Raider of Tombs