This is a side-by-side comparison to between the Surefire XC1 and the ACM clone (received via boom arms).
The SF XC1 has a black, slightly glossy hard anodized finish with laser engraved markings, which appear silver/white.
The ACM version is also black anodizing that is a bit more flat that the SF, but it is also SIGNIFICANTLY softer anodizing than on the SF. I did a scratch test with a steel knife blade and it took very little effort to scratch, while the SF took easily twice as much force without scratching.
The markings on the ACM are also laser engraved