I've loaned out guns "long term" three times in my life. One came back in perfect condition after hunting season, and he had even killed an elk with it. The second one never did come back, a Charter Arms Undercover .38 spl. The third one, a .45 single action, came back needing some minor repairs to the pawl, but that was due to a "temporary repair" I had made to it a few years earlier that finally gave way.
I probably won't do it again.
Sometimes the squeaky wheel gets replaced...