M1911A1 was (still) the standard issue sidearm for us Tank crews in Saudi. (Each "Tank" had its own M16, but that was used only when the crew needed more firepower than the pistol could provide... but didn't need the whole tank.)
What I can tell you is that sand is murder on firearms. Weapons that were lubricated with CLP (teflon cleaning/lubricating oil) collected so much sand that they started to look like sand sculptures. Weapons that weren't lubricated dry rusted or damn near welded their own actions shut. The special purpose oil that was issued to replace the CLP was even worse. It collected sand AND allowed rusting.
The .45's actually fared VERY well under the circumstances. They rusted like everything else, but worked smoothly anyway. Their MAGAZINES on the other hand were another story. If you didn't take apart the magazine for cleaning EACH AND EVERY DAY, the sand would gum it up beyond any hope of ever getting off more than two rounds. And GOD help you if you forgot the clean the spare "clips" for more than a day or two!
I've heard similar complaints from the chopper pilots who showed up at the ALoC on occasion about their .38 revolvers... but having no practical experience with them, I can't validate the claim. If they were like everything else, they probably gummed up around every moving part they had.
My point? I'm sure I had a point when I started this post...
Oh yeah... the weapon is pretty much only as good as its user. Neglect it, abuse it, fill it with sand and rust, and it will likely neglect you when you need it. Some designs (like the M1911A1, undoubtedly one of my favorites) are more resistant to these conditions than other are.
There are valid reasons why revolvers would remain in service LONG after the automatics take dominance. The revolver design does have some reliability advantages over automatics IN GENERAL. The specific cases will, of course, vary with the design. At least that's the way it seems to me.