Huumm- I've used WD-40 for years, ever since we used it in the Armory during my years in the USMC-- never gummed at all. Of my double shotguns, the one with the best trigger(s) pulls is my 1927 era Ithaca 12 NID grade 2E--hands down. Then my older M21 SST 12 gauge field gun (1939 era)-- Pre-WW2 gus are the best of the best-IMO RWTF
Mr. Fox, your armory guns didn't sit idle for very long, I'd guess. It takes a while but WD-40 will sure gum up a hunting club padlock if treated with it and left unopened over a summer...Geo