Make sure the bolt sail oring is good (thick, green). If you don't have the right replacement for it, a normal oring you would normally use on other guns wont work. Also check the inside oring that sits just behind the breech (#017)
If those are good, it'll be the noid... rare case though.
Represent the old, long 68/45k tanks!
Rockin' a Champagne Eigen'd NXT Shocker