:) overall length 44" gas chamber 4"x16" internal space, (4400 4" IPS sch-40 COEXTRUDED CELLULAR CORE PVC-DWV PIPE ) barrel interchangeable one at 2"x23" other 1.5"x23" both barrels are ( PVC TYPE 1 SCH-40 ATSM D 2665 PVC 1120 PR 280PSI AT 23° what would be a good butane mixtures for this? Ps I'm ne...