2 feet 1/2" CPVC, with a 20" piece of 1/2" PVC duct taped/hot glued to the bottom with 2" on each end. If you make a scilencer(sp?) like FA24's, and a bipod and relocate the pump to where the Hornet goes, then plug it, you have an insanely accurate "douche bag" rifle. With insane ranges too.
Umm... hate to break it to you but thats not a sneakshot. That is a secret strike pocket blaster or sspb. Here is a sneak shot mod http://nerfhaven.com...topic=8651&st=0