tank relocation MR4

[Bluerinse]

I am wanting to move the tank on my MR4 to in front of the fuax magizine because i like my pb guns to be front heavy rather then rear heavy which is the weight distribution caused by having the tank in the back. I have access to a metal shop so i was planning on making tank supports that i can put over the barrel and attach strip of metal to the top of and attach that to the gun, and a drop forward (think thats what its called its the thing that moves the tank down and forward when its under the handle) so i can fit a 20oz or 68ci 3000psi tank in under the barrel or a 12 oz co2 with other suports. The only thing i need help with is what type of connections I need(standard/metric) and what size I need