I spoke with attorney Adam Kraut of the Prince Law Firm earlier today. I had asked him a question about the Protection of Legal Commerce in Arms Act and whether Slide Fire Solutions would be protected by it. He went over the requirements of the law and said he'd be posting on the case this afternoon.
He published The Protection in Lawful Commerce of Arms Act and the Fate of Slide Fire in the Aftermath of Las Vegas this afternoon and it is well worth a read if you want a better understanding of just who is protected by the law.
Had Slide Fire not been a licensed manufacturer (or dealer or importer) it is likely that they would be an open target to be sued without the PLCAA coming into play.
UPDATE: Adam has a second post on the issue up at RecoilWeb.com that goes into more depth about the lawsuit itself.