I've had my M40 here for a while, and haven't had any serious problems with it (it does throw the occasional shell at my head now and then). then the other day It jammed up. I was a little surprised. it was jammed in a way that I couldn't pull the slide back to clear the jam. it was stuck shut. So I let it sit for a while(just incase there was something live still in it) and carefully pulled the slide off. it took some doing, but I finally managed to get the barrel free of the slide and inside was a spent casing. Nothing looked wrong with the casing at all. I was using CCI blazer (the brass stuff) when it happened the first time. then I had it happen two more times. once with Remmington, and once with Winchester white. all of these were FMJ. I am not sure exactly what is causing this. My first thought was the extractor issue that people have been having, as all the lugs on the barrel and everything in the frame looks pretty much like new. I pulled the extractor out and cleaned and oiled it, and the channel it goes in thoroughly after the first time it happened. I am thinking I should call Steyr for a send in, but I thought I'd check with you folks first.