With it being a range gun, you have no idea what kind of abuse it has suffered. The stoppages you observed are not uncommon but they are all correctable. The mag feed lips being deformed is a good catch. Poorly manufactured or damaged magazine is a significant source of problems in any controlled-fed weapon since the timing of the release of the round is critical to the feed sequence.
I am surprised that they rented a gun with such a light trigger pull. Most Kimbers start life between 4 and 5 pounds. If you put a lot of cycles through the lock work, the combination of the sear spring and the main spring can loosen up and drop the trigger pull down by half a pound. However, it is not difficult to bring the pull back up above 4 pounds and this is something that the range staff should be able to do.
As Libertarian stated, Kimbers do start off tight and the "break-in" period is intended to be a final lapping of the moving parts. What you will end up with is just enough clearance between the parts to allow movement.
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Wile
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