Recently I was contacted by a photographer who was hired to do product shots for a manufacture of short barreled rifles. They wanted to ship the firearms to the photographer so that he could photograph them in his studio. The photographer was concerned about violating the NFA.
Although dealers and manufactures have the ability to transfer these restricted items, individuals and other companies who are not licensed by the ATF must comply with both the federal and state laws in place regarding possession, transfer, and use of these firearms.
Your possession of the SBR would violate the NFA, and potentially state laws. When you ship the items back to the manufacture you could be violating state and federal firearms laws. Generally, in situations like this, it might be best to go to the manufactures site and do your marketing efforts at their location to avoid violating state and federal regulations on firearms.