This is for Wayne M. In 1980 I built Frank De Haas #2 falling block rifles in .243 and .223 and kept them sprayed down with WD 40 a couple of years later I took one out to shoot opened the action, loaded, When you open this action it has a saftey that slips over the hammer and when I slipped the saftey off it fired. The WD 40 had gummed up the sear and it never slipped into position therefore saftey released, BAM! I check very closely now and use Breakfree now. It can happen in some cases.