Lucky Gunner's .45ACP ammo through the 1911. The gun is increasingly dry, the Slip2000 EWL having been applied almost two months and a case-and-a-half of ammo ago.
Unlike a lot of current polymer guns, where the slide and frame are only sort of flying in loose formation, the former only retained on the latter by tiny nubbins of sheet metal "rail", the frame rails of older designs like the 1911 or CZ75 have a lot of bearing surface. This makes them a lot more sensitive to lubrication or, more accurately, the lack thereof.
356, #1,085, #1,247, #1,492, #1,514, #1,578), a failure to feed on round #513, a failure to feed a round of Hornady Critical Duty +P on round #927, and a failure to eject a round of Hornady Critical Duty +P on round #930. 400 rounds to go.