http://webcache.googleusercontent.com/search?q=cache:UoszsK0zp2AJ:www.atf.gov/regulations-rulings/rulings/atf-rulings/atf-ruling-2010-4.html+Air+gun+ruling+ATF&cd=1&hl=en&ct=clnk&gl=us&client=firefox-a
Big loss in the airsoft community. Currently there are people trying to contact BATF to get a better explanation and reasoning.