I bought mine directly from the manufacturer. Small company, I called to ask questions and the owner answered.
The titanium models are not officially full auto rated, however he did say they test them on full autos and my Brevis II Ultra sits on the end of my M16 and has seen quite a few mag dumps. I wouldn’t recommend putting it on the end of a beltfed like an M249, but controlled bursts or a mag dump here and there with some time to cool in between shouldn’t be an issue.