Here's a pic from last years Pump 101 game at Airsports in Ludlow, MA: http://www.angelfire.com/oz/madd/air/pump5timsplat.JPG
The pic is captioned that it's an '85 Splatmaster. I don't think that's right, in fact, I've never seen a Splatmaster with (what looks like) a bolt-on grip or a back that wasn't flat (vertically, top and bottom tubes should be even at the back end)
It holds the 10rnd tube like a Splatty, and that's the only marker I know of that holds the tube that way, but other stuff looks odd like the trigger guard.
So my question for the experts here, What Is It?