I was at the range last week and took my 357 sig, so I thought it was. I fired four weak rounds which shot about two feet low and would not eject and had to chamber a round each time. I finally looked at the side and it was my GLOCK 23! Since then I shot a full 15 rounds of .40 and cleaned it. I inspected the fired 357 casings which looked like 40 casing after being fired, just a bit longer. I inspected the barrel for any cracks, and shot about 150-200 rounds which shot without any problems, cleaned it and inspected the casings which look just like the fired case that comes with the glock. I have not had any problems since then, I truly believe these guns are not built cheap and use this gun off-duty. Any thoughts on this issue, whats your input on firing the wrong cartridges other than I was stupid for not checking too see if it was the right ammo.