Regarding #1: it wasn't a major name brand round, it was something odd like bison bore or some such in a yellow and blue box. We shot a lot of it that day in a number of different .40 rigs (Glocks, XD/XDms, PX4 Storms, Smiths, ect).A-R wrote: Interesting ... methinks this is similar to my dislike of Kahr polymer-frame guns because of my own previous issues with one. I've since tried a few others - still don't like the gun overall well enough to own one (fits my hands wrong) but subsequent guns have tried from them have alleviated some of my apprehension at the brand in general.
As to the specifics above ..
1. Didn't realize anyone made factory +P .40 S&W ammo - never seen such a thing
2. The Glock .40 attached light problem is another I've never experienced in hundreds of rounds fired with a Streamlight TLR-1 attached to my old Glock 23 Gen 3 - just went bang every time like normal. But I think I've read this problem may have been worse on G22 versions (and more prominently complained about since more LEOs rely on Glock 22 + tac light combo for life-n-death scenarios.
Regarding #2: I believe there has been some documentation of G23s failing to return to battery with lights installed as well. If one must carry a .40 cal Glock with a light they need to ensure that they have good magazine springs, and hope that the spring doesn't decide to get a little weak in a life and death situation.