Crosman 1377 leaks after mods

41 Colt

CGN Ultra frequent flyer
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BC
I put in a flat top piston and steel breech and when pumping it up 10 pumps it leaks. I can hear it best when I open the bolt to load it, and at the muzzle with the bolt closed. Any ideas what's going on?
 
Okay, I took the gun apart and disassembled the piston. I found a tiny piece of "stuff" on the plastic seal in the channel where it contacts the back of the piston body. Cleaned it and now it works fine, no leaks. :cool:
 
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