I have some .223 brass marked "KFA .223 REM." The case the ammo came in is labeled "M-193 .223 " The brand name appears to be Centurion. Is this brass any good . I'm told this is military overrun but the .223 markings makes me wonder.
If it's brass and has one flash hole for Boxer primer, then it's OK to reload. Don't worry about M-193 (the original powder and bullet load). Don't worry about the headstamp.
If the primers are crimped, you may have a difficult time seating the new primer. Swage the pocket if you own a primer pocket swager. Ream it if you have a primer pocket reamer. Or use a carbide countersink bit from the hardware store for $5 chucked into a drill. Or you can use a pocketknife or a champfer/deburring tool. Just cut back the very top edge of the primer pocket just a tiny bit. Doesn't take much.