ATF issues permits for importation of 13,000 barrel shrouds, then decides they are silencers. From the description, it sounds as if the shrouds are designed to look like suppressors, but the barrel really extends to the front end of it ... in which event I can't see how they could suppress the sound any.
UPDATE: at AR15.com, they ask some interesting questions. For example, if it is indeed a silencer, why is ATF asking them to ship it back to the manufacturer for modification? Wouldn't that involve sending an NFA device in interstate commerce without a permit? And transferring an unregistered NFA device?