As to your OOB problem? Have you chrono'd the ammo? It sounds as if maybe the Sig ammo may be weaker and not retracting the slide to full extension or not hard enough. That's how my problem starts. When my issue first starts, the slide will extract and eject, but I'm thinking it just barely clears the round in the mag enough for it to pop up a little to catch the slide and at this point there's not enough energy in the slide to strip the round from the mag. Or it may be stopped on the front of the mag, these mags don't allow much for for longer cartridge lengths, but with the Sig round I would think it would be clear of the front edge of the mag if it's high enough to stop the slide. Next time out I'll check that.
Hope the wife rehabs good. My wife had a similar problem awhile back. She now has a gamma nail in her femur.![]()
I don't have a chrono, but subjectively, the SIG Sauer ammo doesn't feel or sound any weaker than the others. As I think about this some more, I'm wondering if my problem (as george_lehr suggests in #16) is due to a weak recoil spring assembly. About a year and a half ago, I had a bunch of failures to fire/OOBs with .40 cal. in my 40c. A new RSA completely cured the problem. This (my current) RSA has only about 2,500 rounds on it, so I haven't considered it a suspect. But who knows, I may have gotten a short-lived one. (The previous one cratered around 3,500 rounds.) Next time I go to the range, I'll take the original RSA that came with the 40c and try it out. It never had a failure to feed/OOB in 6,000 rounds. I swapped it out at 6,000 rounds only as a precaution. If the SIG Sauers run perfectly with it, I'll have found the source of my problem. Then I'll hit up S&W for a new RSA.
Now that I think about it some more, I wonder if that may be the source of your problem, too. A weak RSA would cause the slide to move forward with too little force to properly strip the top cartridge from the magazine. I guess that's now my universal solution to all M&P problems: Get a new RSA!

Thanks for your concern about Mrs. swsig. Fortunately, the only treatment she needed was rest and rehab. I don't know what a gamma nail is, but I'm sure Mrs. swsig is glad she didn't need one!

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