Board Thread:Warhammer 40k General Discussion/@comment-93.103.40.38-20131021154955/@comment-3258762-20131021155833

In short: No, he made that up

The weaponry used by orks is completely unreliable, and often inferior to Imperial Weaponry unless wielded by an ork. Much of the wargear would not work, and even if it did there is little the Orks have that a Space Marine can use that would be better than what they have.

However, the Chapter Master with the Hand might be someone mistaking Yarrick for a Space Marine, who replaced his hand with an Ork Warboss Power Klaw.