Gun fires only once

[Hitsuke]

I have a problem with my Imagine, whenever I cock the gun and fire the bolt doesn't pull back and just goes back to its resting position. I tried recocking it a few times but that didn't work, then I resulted to dismantle the gun and try to take a look see but can't figure out what is wrong with the gun since everything seems to be in place. How can I fix my gun?

NOTE*** The Co2 tank is full.

[TheDarkShadow]

check the o-rings and make sure the edges on the striker and the sear are not rounded off

[big_daddy_d]

first check the battery, may have to throw a lighter spring in there...