From Bearing Arms:

The agency hasn’t said if there were any specific concerns that led to the highly unusual move, which is ostensibly meant to “further assess current firearm export control review policies to determine whether any changes are warranted to advance U.S. national security and foreign policy interests” and “enable the Department to more effectively assess and mitigate risk of firearms being diverted to entities or activities that promote regional instability, violate human rights, or fuel criminal activities.”