Leakage

[Lithium406]

My A1 is leaking thru the exhaust port in the breach of the gun. WDP's site says either the exhaust stem or the guide. How would you know if it was one or the other. Both look like they are in great shape. Orings are fine as well. I'm still new to these guns so any help is appreciated. Thanks!

[Backman]

If you happen to have spares, start switching the exhaust valve stem etc and see if the leak goes away. In my experience, almost 90% of my leaks were a worn exhaust valve stem that I couldn't see wear on with my naked eye (of course if I would wear my glasses ocasionally but that is a different story all together)

[Lithium406]

How often do they wear out, and what exactly wears out on them?