Well one or both of the things the Sig CS guy told me worked.
I shot a box of the American eagle brand 124 grn and watched my grip, and the slide locked back on every empty mag.
It is running great now.
I am a 1911 and Glock guy, so my grip tends to be very high with my thumbs way up just below the slide. I think I was accidently working the slide release with my thumb. This is my first venture into this platform, and I guess I just need to shoot it more.
For now, my 1911 is still my EDC, but I sure do like the way this gun shoots. Besides, I didn't have a 9mm, so I had to get it, right?
SGT U.S. Army Special Operations Command, Ft. Bragg, NC (2002-2006)
Operation Iraqi Freedom Veteran (2004)
"Democracy is two wolves and one sheep voting on what to have for dinner. Liberty is the well-armed lamb contesting the vote." - Benjamin Franklin.