Mr1 leak

[speedemon]

I have a mr1 with rocking trigger and alamo city low blow bolt running co2. I took the gun apart the other day to clean it after playing as I always do when i put it back together i could here air leaking inside the gun where the bolt is. This has me puzzled i took it back apart and checked all o-rings they look fine. Any thoughts on what might be causing this? thanks

[chnk]

hmmm check the cupseal, its the little white thing that is attached to the valve pin, try to see if its a little loose and if it still leaks you'll need another one,

cupseals are cheap to replace, so if thats the issue i wouldnt worry about it much,

[oldironmudder]

Is the bolt cocked when you aired up the marker?

Have you checked the cup seal & cup seal sealing surface?