Marine Cpl
.577 Tyrannosaur.
Try it. I've run it on Glocks, AR's, and Rugers. That 1911 Series 70 I had saw WD-40 for over 30 years before my dad gave it to me. No wear or gumming.Round nose 158gr was not as effective as modern .38 special and I believe ballistol was around back in the day. Oil is not oil (to a certain extent) different resistance to temp, different viscosity ect. I use Mobil one and ballistol. I might do an experiment and use wd-40 on a gun and run it until it fails just to test the wd-40 works fine theory. Nit scientific but I want to see what happens when it get hot.