Actually hearsay, unconfirmed. Some of the replies on his blog page referred to a relationship with Remington, and Remington advertising is all over the blog.
He does not appear to be featured on their website though.
Seems like Jim Zumbo's distaste for `assault weapons' is based on economic and not principled reasons. As a rep for Remington Arms he naturally would prefer that hunters buy his firm's expensive hunting rifles rather than relatively cheap AKs. Just more good-gun-versus-ugly-gun crapola. Heard the same from ex-Sen. Bob Kerrey & others.
But that view's shortsighted, too: U.N. gungrabbers have declared scoped bolt action rifles to be "medium range sniper weapons", equally liable to be banned under their New World Social Order.
This man is not to be trusted.