Here's the sequence of events:
My primary M&P9, a 2009-bought one with a Storm Lake fitted barrel. Installed a new front sight, was getting the thing dialed in for windage @ 25. Freedom Munitions "new" 115gr RN, which I was using to get a general read on where it was printing (before confirming with 124gr GDHP).
First round in the mag fires. Next trigger pull is mush, instead of BANG. Started to do IA, but stopped myself, looked and saw that next round was hung up.
Bopped the backplate to see if it'd go into battery, no joy. Download, inspect that 2nd round to see if something about it was wonky. Nope.
Jam it back into the mag, re-insert into slidelocked pistol, attempt to drop the slide. Nuh-uh. Remove mag and round, try to do a chamber-check by just dropping the round into the chamber on it's own. No dice.
Decide to check for a squib, despite having not noted either audible pop or reduced recoil. Nope....but lo and behold, there's a visible line/rim about halfway into the chamber. Nabbed a thin punch from my range bag and teased out what appeared to be the "upper" half of a 9mm brass casing.
I didn't manage to save it, and spent some time fruitlessly searching for the "lower" half of it.
But, after reassembling everything and shooting for another little bit, it happened again. Cleared the chamber without having to disassemble, kept what I'd found. The case-rim end of the brass had thankfully landed on the table. Here's the evidence. The piece on the right was in the chamber, and I think I have it with the mouth facing up, judging by the marks.
That's a near-perfect, symmetrical cut across the width of the brass; there's no tearing, bulges, anything like that. I'm amazed, as the only case failures and whatnot I've seen, to date, all exhibited some kind of specific deformation, bulge, or asymmetric tearing.
My question is: What the HELL...!?
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