Word of Caution/Possible Resolution

I found this video on Airsoftgi.com and I believe this is how I broke the gun and this should solve my issue and hopefully fix my gun. I will try to reinsert the pin tonight. I will post again soon after I have attempted the fix. Please comment

Edited: Commander52 is correct, i cannot insert the pin unless the bolt is in the down position and my bolt wont go down. There is a hole in the front but the pin will only go in the back. I tried slamming the bolt handle down while in the back position but it would bring the little box with it so it is still covered up by the box thing behind the bolt handle...any other suggestions?

UTG MK96 Airsoft Sniper Rifle Broken!

A few days ago I was fiddling with my UTG MK96 and I cocked the bolt really fast and too hard and now the bolt is not working correctly. The bolt will go forward and back all the way but when the bolt is in the forward position the bolt handle will not go down, therefore I cannot fire the weapon. When I cocked the weapon a very small bullet shaped piece of metal came out of the back of the bolt. I do not know what it is but I still have it, figuring that is the problem. The spring is still in the cocked position and has been for a few days now so I am concerned that I will wear down the spring if I do not fix this soon. If you have any ideas for solutions to my problem please post comments.