Given the horrible reliability of the SR1 and the fact they are in their third design iteration to try and resovle it, that would say really bad things about Atomic.Word is that Atomic is making the SR1 for Sherwood.
More importantly, few companies actually produce their own regs. Most either do original design work then out source the production to one of the larger and older manufacturers such as Sherwood or Tabata, or market other designs made or acquired under license from other companies.
Given that Sherwood is one of the oldest manufacturers around and has been producing regs for other companies for decades, I doubt that one of the youngest companies around is making anything for Sherwood. Plus Atomic was started by engineers who used to work for Scubapro who also used an outsource model with most of their designs being produced by Tabata and it is very likely they follow a very similar production model. Really godo production facilities are hideously expensive adn the small volume of the scuba industry does not make it worth having your own production facilities when you can spend less having your designs made on someone else's state of the art equipment.