BUNNY22: Ahhh. Now maybe you can answer my questions?

I did search here for teh movie Saw and noticed many people had enjoyed it. I very well did too. It was one of teh most exciting and unpredictable movies that I had ever seen. But I just couldn't realize why Dr. Gordon couldn't use the gun and the one bullet he had to break one of teh locks on his chain, or why at the end, Adam couldn't do the same with the gun that had remained from that Mr. Hindle, or whether or not it had been Jigsaw all the time that gave both Adam and Dr. Gordon electric shocks. It can't have been him, since his arms were wide open, so it must have been Hindle.
Then how come Jigsaw had a tool to do that in the end?