contender
Ruger Guru
This topic would make a good "sticky" here.
Agreedcontender":mzn7lebz said:This topic would make a good "sticky" here.
I_Like_Pie said:For the inside of barrels I plug them up with dowel rods to prevent the acid from pitting.
I suppose that one would have a similar situation when hot salt bluing with rust getting into nooks and crannies. With that respect there are no shortcuts with rust bluing. You have tho take everything completely apart just like you would for hot salt bluing. A toothbrush, wet cotton cloth or toothpick can be used to card the nooks and crannies in the receiver. Items like the barrel to receiver threading are so tight that you should not have any issues with rust or acid getting into the threads.
I do think it would be possible to rust blue only the barrel with the receiver still attached (or visa versa). Rather than use oil or grease to protect the receiver you could layer a temporary coating of spray paint to the parts that you don't want blued and then remove the paint with thinner or a remover that wouldn't hurt the bluing after you are done. Same for the internal bits you are wanting to protect. I have done this with parkerizing and it worked very well.