There is a minor mistake in the Force Requisition of the Astra Militarum codex, and that is that the Scions and Tempestus command squads do not have their hot-shot volley guns listed. They are in the codex, but if you are building lists with the Force Requisition right now like I am, just be aware that they are not listed.
I am sure we will see an update soon. Thanks to a reader for pointing this out.