I have had several chain fires with a baby dragoon brass frame that I built from a Dixie Gun Works Kit back in 1970 or 71. It was very sloppy fit on all the parts. The multiple cylinder discharge - sometimes two and three at a time gave me the jitters and were caused by the discharge flame entering from the nipple when the percussion caps either fell off or the cylinder contacted the recoil shield. As I said the gun was VERY LOOSE. I ended up retiring it and eventually junked it. I now own MANY steel frame revolvers from Pietta and Uberti and never had a chain fire since that baby dragoon kit gun.