Crosman Crosman 157 resealed but it leaks -- Pls Help

[vintageairguncollector@gm]

Bought Baker airgun kit and installed it. Gun shoots about 30 shots but then I can hear the gas leaking out the barrel. Slowly and quietly the gas leaks out the barrel.

Could someone with experience help me? What did I do wrong to make the slow leak? The airgun was broke when I bought it on ebay and I am a newbie just trying to learn about airguns.

 

[Airgun-Revisions]

That’s about the shot count you’re going to get give or take. If you installed a new hammer spring this is probably the reason why and it’s holding the valve open slightly because of the low pressure inside. The gun seems perfectly fine and just needs to be shot a bit so the hammer spring settles down.