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I have known 2 people who have owned a Sigma, one in .40 S&W and the other in 9mm. The one in 9mm was a lemon and would always jam. He sent it to S&W 2 or 3 times and that made it better but it would still jam every 3-4 mags. like clock work. He sold it and now has a P95 that has had no problems after the initial break in. The other guy who still owns the .40S&W has nothing to say but great things about his Sigma and says he has never had a problem with it.

I think they are hit and miss but I had a rep. at Academy tell me they were a nice paper weight that they always get back and a gunsmith at a local gun store and shooting range told me he would never ever carry it concealed or for home defense and just for range practice, nothing more. He said it is a far cry from the M&P. This was 2-3 years ago and I heard S&W solved many of the problems with the Sigma but since it got such a bad name the brought out the SD9 and 40. Which is the new sigma renamed and improved so people will buy it and from what I have heard so far they are a pretty good handgun for he money.

Send it in to S&W at see if they can fix it. Otherwise if you want another affordable pistol that has fewer problems get a Ruger p95 or check into those new SD models. Just my 2 cents.