更新1:
OK. I'll clarify for everyone. Here's a link to the actual notice. http://www.atf.gov/sites/default/files/assets/Library/Notices/atf_framework_for_determining_whether_certain_projectiles_are_primarily_intended_for_sporting_purposes.pdf Now go to page 12 where they start to define the categories. Category I basically says "we're ignoring 22 rim fire." Then read Category II.