I have been having some extraction problems on my P72 Hornet, culminating in a major lockup the last time I had it out to the range. Took it apart and found burrs on the edge of the chamber. I'm confident I can fix it with a fine gouge slip or maybe a diamond Dremel burr in a pin vise - but I'm mystified as to how it got this way in the first place. The only thing that contacts the chamber face is the brass casing, and brass is a lot softer than barrel steel, so what buggered up the chamber face? It's a mystery. While I've got the thing apart, the mag latch spring is broken so I'm making one according to instructions and photos posted by Gunner 620 and Deersako. Thanks to both! Here's a photo of the chamber face on my P72.