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FX Indy "air lock". Not sure what to call it.

Hello all,

The last few times I've taken my FX Indy bullpup out of the case, I am experiencing what I would call an air lock. When I extend the pump lever to the full open position, it is hard to do and it feels like the lever does when I'm on a downstroke, putting air into the cylinder. Normally, it extends very easily, now it's as if it is trying to pump air when opening it. So, I use some additional muscle to get it open once, and then it works just fine the rest of the time.

Does anyone know if this is normal? What could be causing this?

I love this airgun by the way. Have had it for 2 years. Thank you for the help in advance.

Tom