I bought one, and when you have the valve closed, you can hear the air leaking out. When you open the valve, the air is leaking still out of the end of the valve where the knob is. So I got a replacement and the other one is just like the first one.
Anyone else have this problem?

Kermit Airgun Club
http://www.kcugonline.com/kac/

rob ive bought an airsource kit and have not had any probs yet i know theres a hex type screw in the valve knob try thighting that it might work. my guess is just tightin everything. well thats my thoughts and i must say u have a great site man very informative.
peace john

thanks. I'll try that. These little 1077 are the funnest air rifles...

Kermit Airgun Club
http://www.kcugonline.com/kac/

I had the same problem and called Crosman. They told me that if the knurled knob that holds the AirSource adapter in the c02 tube is tightened all the way, that it wil prevent the nose of the adapter from sealing properly. They said to tighten it all the way, then back off about 1/4 to 1 full turn and see what happens. It worked for me, no more leaks! I found that if i backed off about 1-1/2 turns it sealed right away! Good luck!