[ericcumbee]

They happen even in quality weapons like a 1911 or your modern Glock or Sig Sauer. The biggest one is Failure to Eject, where the cartridge casing fails to completely clear the chamber and gets stuck in the extractor.

They do test fire them at the factory (10 rounds or so) but it takes anywhere between 200-500 rounds to properly break a firearm in. And even then it can depend on the brand, type and quality of the rounds you are using. I bought a bunch of cheap ammo for practice. my Sig Sauer runs it fine, my friends old no name gun Fails to Eject it 1 in 5 times.

That is why most firearm instructors say to never trust a firearm and ammunition combo for defensive purposes until you've run 500 rounds.

[alistairSH]

Another thing I've noticed - the 1911 is produced by a wide range of manufacturers. The boutique brands can be a bit finicky and the buyers are often tinkerers, which can give a pistol neophyte a skewed perception of the design.