pm5 air leak

[Danny.H]

i have a pm5 and there is an air leak comeing from the back of the bolt
i have checked the orings and they seem to be fine.
dose anyboady have any ideas what it could be.
thanks danny

 

[Syd (NSPL)]

Check the two small orings on the inside of the bolt (closest to the rear) and ensure everything is greased.

Also, check your input pressure as setting your hyper 2 reg too low can prevent the bolt from sealing correctly and this often results in air coming out of the back cap. Simply dial the hyper 2 reg up to solve this problem, but do this over a chronograph as you do not want ot set the input pressure too high.

 

[Danny.H]

ok thanks i will try it now