This is a BB machine gun I made. It has two seperate inline vortex blocks inside and fires 6MM airsoft bbs. The gun and tripod are made completely of PVC pipe or sheet and hot glue with the actual innards made from wood and metal. The body is 4" PVC and the barrel shrouds are 3/4". The tripod is also 3/4" PVC pipe. I ran out of spray paint so I can't paint all of it right now. I am also planning to build a .177 cal minigun in the near future.