I was going to comment that it appeared to be mounted to his marker (as it was moving independently of his head/shoulder).
Looks like a Tippmann 98 with the AK kit; maybe he mounted it using the rings shaped into the back of the clamshells (usually used to grip a stock or the factory endcap). You'd only have to have a pipe that thickened in those two sections and the marker body itself would hold the rig in place.
Originally Posted by Hooligan
I found a way to make a sabot for a twinkie. The other tanks smell like banana cream filling now.