Time to stop the Bloomberg song and dance.
Check it out:
A special commission set up by Connecticut Gov. Dannel P. Malloy after the Sandy Hook shooting may include a number of recommendations in its final report from registering all firearms, to tracking ammo, and screening owners.[…]
Besides previous recommendations to prohibit both the sale and possession of any firearm capable of holding 10 rounds or more without the provision to grandfather guns, included in interim reports, the final draft calls for any shell casing for ammunition sold in the state have a serial number etched on it for tracing purposes.