Iver Johnson American Bull Dog

I bought this American Bull Dog 20 years ago as a project. I put it in my safe and have not touched it since. It has homemade wood grips. The cylinder pin pulls out leading me to believe it’s missing parts. The gun dry fires but the cylinder spins freely and does not lock into place, and the trigger sticks depressed until you move it forward. I believe it is a 44 bull dog but I have not measured it. The serial number looks like it is 2706.