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Each pistol is a little different, but I have found 1911s to be very dependable. I have a Colt defender with 20,000+ rounds and in 20 years I have only 3 FTFs and they were under the exact conditions you described. I replaced the old and badly worn factory magazine with a Wilson Combat magazine and have never had another problem. My Kimber has about 3000 rounds through it and has never had a stoppage even during break in. I purchased new Wilson magazines for that pistol when I first got it and have used them exclusively. A good quality magazine can make a world of difference and 99% of my shooting is with cheap range ammo. I give them a complete strip and cleaning after every range session and no, I don't "bury them in the mud" or "run over them with a truck".