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ICS usually don't have parts that seal well, from what I've seen they use TM's 10 year old stuff.
Get a new air nozzle that has an O-ring in it, and an ARS cylinder head.
Unfortunately with the ARS head, you'll have to shave off the 2nd tooth on your piston, but those cylinder heads seals REALLY well against the air nozzle.
And it's a critical seal, I've seen a 30fps loss from a bad air nozzle-cylinder head seal many times.
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