Brand new A5, E grip not working

So i just got my A5 3 or 4 weeks ago, the H. E. E grip had been working fine until I went out to shoot. I chopped a ball so I emptyed the hopper but there was one in the chamber held by the dettent(sp?), tried to fire tthe gun to get the ball out but nothing happened. Checked cocking that was fine and after a half an hour of playing with it, it finally fired once and hasent fired since. Checked battery, but didnt want to look to far into the trigger  assymbly just in case but I took it out and looked at it and I am missing the slider and 2 pins which I understand to strike the sear. I had never taken apart the trigger b4, Is it possible to fire the slider out of the gun ? what should I do?

I tried comparing parts and it seems I have all the parts, and I even took it to my local Paintball store and the techs looked at but they couldnt even get it to work, so i guess im just gonna have to send it in to tippmann..... ty for the suggestion 

Thanks for all the tips guys, I did send it into tippmann, they had it less than a week and it is fully operational now!