malfunction

i am relatively new to the 1911 platform and just purchased a used Colt commander 70s series. I was having some malfunctions with the cycling where the casing wasn't being extracted from the chamber. This would happen about 10-20% of the rounds i shot. I was using both Colt and Wilson mags they...

UPDATE: I think I figured it out and I'm fairly certain this is a problem with the ammo. I duplicated this malfunction with my other two 1911s that have been flawless - a Colt that's been worked over by Wilson Combat, and a Springfield Operator that has been reliable in 2k rounds. Both had...