I missed out on buying a punisher cannon when they could be easily obtained through the various
bits-sellers, now of course the damn things are as rare as hen's teeth. Since I want to try out Pask in a Punisher, I decided to build my own to go on my Ragnarok/Russ.
The mantlet was a spare demolisher mantlet that I had lying around, I attached a piece of 3/8" ID tube to serve as a mount for the gatling gun. The gatling gun itself is 6 pieces of 3/32" tubing around a 1/8" hexagonal rod. I added a couple of slices of the hex rod on to the mantlet to add detail to the spots where I cut off the demolisher cannon shock absorbers. I added a piece of round rod to the hex pieces to give the look of a bolt.
And all painted up: