Lasz,
I'm no fan of the BATF, however, the HA's are not dinosaurs. They are a real drug-pushing, murdering, and dangerous group. Look at my post above to see some of the activities the Angels have been up to here in AZ.
And the drug they're pushing is meth. And meth doesn't need to be transported across the border. Meth is cooked right here in the US. Meth labs are everywhere. Gangs like the Angels still have a major stake in both production and distribution.
Besides, the question of the guns wasn't the type or number. The question is how many of those Angels had felony records making them prohibited possessors?
Another fact is that the Angels are easier to infiltrate than the New Eme or Sueranos.