That was the NOLA PD not the feds. Also people that buy AR-15's are very different than your typical handgun/shotgun owner and are more likely to resist violently.
They had the DEA and National Guard, along with CA Highway Patrol and other various state organizations.
The National Guard, the Oklahoma National Guard, and US Marshals did an awful lot of gun confiscation, too.
Watch this video. It will make your blood boil.
Scroll down the page:
WELL.....sorta. It was also the national guards from other states, notably some very antigun areas. Like the State of Illinois, where brother Barack hails from. THey said the duty was very similar to duty in Iraq but felt strange because of it being Americans they were aiming their weapons at. Still, they had to do it. After all they must follow orders.... Sound familiar? I don't care who is acting: local state or feds. Anytime a law enforcement officer follows orders to the detriment of the people then we no longer live in a free republic. Katrina was a wake up call. Still, the sheep continue to graze.