I've had my M40 since 2000. It's from GSI, was the promo deal with 1 10 rnd mag. I haven't shot it much maybe 100 rnds. The only problem I've had is 2 failure to go into battery. I was shooting some reloads using lead SWC's. Just tapped the back of the slide and it went into battery. I just wrote it off to the lead bullets. After doing a little checking for prices, I found this site and others. seems like these pistols have a few issues. Makes me want to sale it, but I would have a hard time selling it if it is going to develope problems down the road. You guys seem to have worked out some of the problems, but I've not seen anything about failure to battery on this forum. My gun is a low ser.# 00XXXX. It was supposed to be a factory demo gun. Did they maybe tweak these guns to work right? I have a 1000 questions Are Hi cap mags still avalible for the old style guns? How much is the new extractor and spring? What does the trigger upgrade consist of? Has the factory had a recall to fix these problems? I read on another forum that they changed the material the frame is made of, if so , why? Well maybe not 1000 questions. I really like the way the gun feels in my hand, and the way it shoots. Way better than the glock I had before it. I even like the goofey sights. This forum has been very informative. Thank you in advance.