KWC desert eagle problem

[dunreal3]

So something has gone terribly wrong with my deagle! There is a rubber piece that has come out of the front barrel at the back. Also the barrel will not stay in properly anymore. When i fire it will get to the 3rd or 4th shot and will not load the bb correctly the barrel will partly fall out the front of the gun and the rubber peice will either stick to the back firing mechanism or fall out when i open the slide again. I suspect a piece may be missing but i dont know, any ideas? Thanks

[Stormsk1]

Just take it apart and check what's broken