After my range time I cleaned the weapon and periodically racked and dry-fired it to keep the sight picture in muscle memory. A couple of days ago, I thought I'd relube the slide, but when I tried to drop the trigger guard I didn't remotely have sufficient strength to do so. When in doubt, lube it up. I used Hornedy OneShot liberally on the trigger guard, and in the slot in front of the trigger. No joy! Finally I resorted to pushing out the two pins holding it into the receiver, the one above the mag release, and the one in front of the trigger guard. From the appearance of the trigger guard and the inside of the receiver, the lube from the range time had made so much sticktion that the trigger guard couldn't be moved.
The solution was to dunk the trigger guard in IPA, lube the mag release area with OneShot, then grab a felt buffing tool for my Dremel, some MoSO4 powder, dose the felt liberally with the powder, and burnish the parts of the trigger guard and receiver that touch. Reassembly brought a huge surprise. Before it was always somewhat of a challenge to pull the trigger guard forward and down, now it was almost trivial. Normally I run my weapons dry with MoSO4 on sliding surfaces, other than the slide rails, there I use Brian Enos' Slide Glide. Now I know that even where there are no really critical friction points, you still have critical friction points!
I've been using Sentry MoSO4 powder. It's not cheap, but it lasts forever.