I have posted more than once regarding the mess that WD40 can make, these pics depict what I and others have been talking about. In my experience WD40 was completely immobilizing the firing pin in Browning BT99 shotguns. Anyone familiar with the BT99 knows they have a rather stout F/P spring, the varnish formed by WD40 was enough to prevent any movement of the F/P. Save the WD40 for fish attractant, squeaky hinges or whatever. Lube firearm mechanisms with whatever other lubricant is your lube of choice, there are a host of choices.
Last edited by gunswizard; 01/20/15.
