In an expected knee jerk reaction to the Colorado tragedy (that could have been stopped had the theater allowed carry... but let's not let facts get in the way of anti-gun legislation) liberals have submitted bills to require face to face purchases with ID for ammunition so that each sale can be tracked, also, sales of over 1000 rounds in 5 days will get you reported.
In the senate, S 3458, https://www.popvox.com/bills/us/112/s3458
In the house, HR 6241, https://www.popvox.com/bills/us/112/hr6241