Sigmas? Carried one for a long time. Heard all the flap and found that most of it is produced by someone who has some kind of a stake in trying to make the Sigma look bad. No accusations here, just experience:
I'm the CFI for a small police department. We carry S&W Sigma model F in .40 S&W. We have had eight pistols in service for the past four years and each has an average (guessing) of 2500+ rounds through it. Mine has had 7000+ rounds through it. We have yet to experience any non-amunition related malfunction.
The ammunition related malfunctions were all due to poor reload quality (the reloads we had at the time were 180 gr rn lead bullets in cases that had beeen fired 4 or 5 times, but had never been properly trimmed or resized full length (the die was set improperly)):
1 separated case head failed ejection, the case head came off and ejected leaving the body of the case in the chamber with nothing for the extractor to grab. (my pistol)
A dozen or so FTFs in two other pistols. Found that this was due to chamber size variations. We switched from reloaded practice ammo to factory made commercial ammo and the problem vanished. (these guns would have been fine if the reloads they used had cases that were full length resized)
1 Sigma also had a double charged reload run through it. The gun bucked hard and locked back. The officer shook his hand,
examined the pistol for obstructions, dropped the slide, and continued the drill.
I hesitated to share this at first, because there always seems to be someone out there who wants to bash the Sigma, but I love 'em. When we trade in these guns, I'll try to buy mine and I'll recommend we replace them with Enhanced model Sigmas.