I'll chrono it this Sat when I can get out to the field and do some more through testing. It seems to push air OK, when dry-firing. I was disappointed it didn't operate more quietly when taking some test shots,however. My friend had a Echo1 ASR that was in-audible, his explanation was the seal was so good that the piston was slowed by the backpressure when pushing a pellet, thus did not hit the ASN with as much of a "snap." He explained that the Y-Ring was largely responsible for this "super-seal".
I fiddled with my cylinder and could feel a fair amount of air being driven out through the slot on bottom of the cylinder (through which the spring and guide are visible.) I did't try this again however to see if the Y-ring improved matters.
I suspect that shortening the spring and sorbothane are more likely the awnser to quieting the action down.
- Thanks, I was unfamilar with the double-seal o-ring concept, and did not realize that they were not a "airsoft specific" item, available almost anywhere o-rings are sold.