I was excited about a production legal hammer too and then realized why their hammer for CZs is legal. It's available on the custom shop guns from the factory if I'm not mistaken (As a CZ Custom Hammer). Therefore it's a 'production' part...unfortunately, with my take on the rules, since it's a visible part and not offered on the Tristar/Canik from the factory it would NOT be production legal.
I imagine you could slide by in local matches but it would be a no-go at a major or area match. I may be way off here and we can hope.