Im in need of suggestion on how to fix the following problem.  My Shorty fires the first 30 or so rounds without a problem.  Then it fails to extract the fired round.  I thought it was an extractor problem, replace that, still had the problem, changed ammo (From steel cased to brass) and have changed magazines, just to see if that was the problem.  Anyone else had this problem?  Any Suggestions?

If you were shooting steel cased ammo you may haver a laquer build up in the chamber. Try a good cleaning and see if that helps.

Have you cleaned the chamber well? If you've been shooting steel stuff you can still have some lacquer in the chamber.