Ignore the "MC" moniker....and substitute "FMJ". It is copper jacketed FMJ ammo, with brass cartridge cases. Actually, the bullets MAY be BRASS jacketed. I'm not sure....but the bullet (jackets) look like brass, not copper. No matter, anyway.
I've shot a ton of it.....it's great quality ammo. Very consistent, accurate and reliable....and VERY clean. It is my favorite commercial 9mm ammo, without a doubt.