What caused my failure to extract?

[Icopy]

Last night at the range, my MKIII had its first malfunction. It failed to extract the empty casing and tried to load a new round. Needless to
say, the gun jammed. I was shooting 124 grain 9mm magtech ammo. The gun has about 500 rounds through it with new Wolff springs throughout. The mag is a factory 13-rounder with 5% extra power Wolf spring. After clearing the malfunction, the gun functioned perfectly again. What could have caused this?

 

[George Stringer]

Icopy, it could be a number of things but with only one jam it's difficult to say you really have a problem. For instance that one round could have had some oil or dirt on it, casing could have been bulged, etc. George