I can see that the hammers are marked left and right in marker, so someone had it apart recently. It is so close to working that when I open the gun if I pull up on the sear it will move into place and lock on the hammer.

Could it be that something was swapped side to side upon reassembly (such as a cocking rod)? I can only assume that the gun worked before being torn apart to be coated. I would rather try almost anything else first before stoning away any metal.

CHAZ