Glocks aren't the only firearm that had/has un-supported chambers. Brass picked up at the range with round primer hits (top piece of brass). 2nd & 3rd pieces of brass show a bulge in them. The bottom 2 pieces of brass had the "bulge" sized out of them, note the double wear rings/marks on them.
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The brass pictured above was factory ammo shot in a s&w shield.
This is what starline says about their 9mm brass:
"9mm brass: also known as 9mm Parabellum, 9mm Luger and 9x19mm. This cartridge is now one of the most popular pistol cartridges in the world. **NOT RECOMMENDED FOR USE IN S&W SHIELD PISTOLS WITH NEAR-MAX OR +P LOADS, DUE TO POORLY SUPPORTED CHAMBER CONDITION**
A link to starline 9mm brass
https://www.starlinebrass.com/brass-...M-Luger-Brass/
Myself, I only use ww/federal/blazer 9mm brass. There's always a bunch of it laying at the ranges in my area. I do inspect and sort anything 9mm brass I pick-up even though it's factory ammo. I do use remington once fired 9mm brass for long bodied bullets, the remington brass is thinner than the ww/fed/blazer.