Master Replicas started going under after they refused to agree to the
LFL's terms for re-licensing of the star wars line. They picked up Halo right around that time frame. because of their failiure to come to an agreement, they inevitably died not too much long after the fact. They canceled the Halo line before they up'ed and died.
I know that they had numerous prototypes, such as the FX energy sword (which was fully working), mini helmets, and 18 inch die cast and rubber master chief figure as well as a cast metal hornet. As for the helmet, I didn't know they even were going to do one. It's ashame MR couldn't see their company's death coming without
LFL's license...