Hi everyone, first time for a ?, been lurking for a bit. I am/was looking for a Model 19, 581, or 586. A friend had the 13, but I don't care for the barrel look on this gun, but it has a really good lockup. Finish is about 70%. So my question is can I rebarrel this 13 with a 19, or 58X series barrel? Is this gun worth anything that I would be messing up by changing it out? Collector value? Thanks...