I don't have a 1st model Dragoon, but the Walker cylinder will work on a 3rd Dragoon frame. It indexes and locks up OK. I think the chambers will line up with the bore.
You will need to take half an inch off of the forcing cone, That's basically all you have to play with, so I'm not sure you can get it to fit without milling down the frame contact area of the barrel as well.
You will also need to mill out the ball clearance area on the barrel because the longer cylinder is going to make that disappear. Probably you'll need to shorten the rammer too.
Good luck.
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