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I have heard of possible issues for years, but never an explanation.
RKBA Ping List
This list is for all things pertaining to the 2nd Amendment.
Please FReepmail me to be added to or deleted from this ping list.
Dono, but if you get touched in the forehead with a .17 your future is a mess.
The mil-spec brass is thicker for added reliability. The chamber leade is more gradual because match-rifle accuracy isn’t expected or required in an assault rifle. I suspect the leade was set based on torture tests and the effects of heavier use (read: barrel fouling and minimal cleaning) than a commercial .223 would see. Plus, there has always been a tiny bit of weirdness within NATO, where member countries adopt their own, home-brewed version of the “standard” ammo. Stuff like overall cartridge length is the same, but bullet ogive may be different.