I have a Colt Detective Special ll (ser.# 2235su) that I just picked up used. It has what I think is a problem. It fires just fine single action but wont fire double action. Everything seems to be working, the hammer goes back and releases just fine in double action but no marks at all on the primers. I'm pretty sure it's not supposed to do that. So, is there any reason someone would modify somehow, this revolver to only fire single action? Or is something broken inside? Any help would be greatly appreciated. I haven't taken it apart yet because I'm hoping someone here can point me in the right direction.
Thanks in advance,
Dave