Welcome to Halo Answers. What would you like to know?

You just don't want to know. On shotgun shells it's a Hippo. I think is says MC on Assault Rifle bullets. Look in Halo 3 (use the video mode and pause it when your firing an AR. Look for the casing of the bullet and it says MC on it.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.