And the 9mm AR is designed to function that way. Grind the locking mechanism off a 9mm locked breach pistol and it will likely blow up.
Something that may be of interest. No Kb, but not exactly "locked" considering the cartridge:
https://www.forgottenweapons.com/ria...923-autorifle/
"and is known today for having ejection so forceful that it could actually stick cases into wooden planks placed close to the shooter"
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