Geo 2.1 strange leak
Hello. I am having a strange problem with a friends geo 2.1. Usually I am able to figure these things out.
The gun cycles fine but has a leak down the barrel. I tried replacing all o-rings which didn't fix the problem. So i tried other orings with no luck. Specifically, since the leak was down the barrel, I test fit the inside can oring, the 14x2 on the prop shaft, and the bolt sail to ensure they were getting a good seal. Also checked and replaced the 2 large ones on the outside of the can.
The gun was fully torn down and cleaned, and it doesn't leak with a core out of a different gun, so I believe the problem is in the can, bolt, or prop shaft of this gun. I tried subbing in one part at a time from the working core. However the gun would not stop leaking with any combination of the working / unworking parts. Only when the whole core was swapped out did the leak disappear.
I know this is a lot of info. Hopefully it makes sense. Anyone have any ideas?