Need help with G&G G96
 

Hey everyone, sorry if this is the wrong section, but I'm banging my head against the wall.

I am having trouble with my G&G G96 gas rifle. Basically what is happening is after I fire, the bolt gets stuck down and won't allow me I load the next round.
From what I have been able to find online, wear can cause a small dent on the bolt, I have already sanded it flat and the problem persists.

http://img.tapatalk.com/d/14/05/15/bybyja5e.jpg

I'm not sure what else I can try. Please, if anyone can help point me in a direction that may help, I would really appreciate it.