An old ex-mil armorer once told me that 80% of 1911 malfunctions are magazine related. Not sure if that is true or not, but its the first place I have started for 40 years with them. And honestly, i dont think he was far wrong.
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I believe that makes a lot of sense. Of the 3 things I did/do to make both my EMP CCC 100% reliable, (1) thorough cleaning, (2) polish the fed ramp a little bit, and (3) always rap the loaded magazine on my palm or the bench to make sure all of the rounds, especially the short flat nose hollow points I shoot are seated well against the rear of the mag,, the tapping of the mag to make sure all of the rounds are seated nicely against the rear of the mag I think is what is most effective. No matter how blunt a nose on the ammo, if I tap the mag before putting in my mag pouch, I never have any failures of any type. Does not seem to be necessary with any of the round nose full metal jacket ammo I shoot, but absolutely makes a big diference with the very flat nose Hornady Flexlock Crtitical Duty and Critical Defense as well as the very very short and very flat nose Corbon.