Connecticut Gun Owners Run Down Registration Deadline A man looks at a shotgun during the East Coast Fine Arms Show in Stamford, Conn., on Jan. 5, 2013 Connecticut gun owners have just two days to register certain types of weapons and ammunition before a new state law makes them illegal beginning Jan. 1. Gun owners have flooded the state Department of Emergency Services and Public Protection office in Middletown recently to submit applications for assault-weapons certificates and high-capacity-magazine declaration forms, the Associated Press reports. A sweeping gun-control law, passed earlier this year following the Sandy Hook Elementary School deadly shooting, widens the definition of assault weapons and bans the sale or purchase of magazines with the capacity to hold more than 10 rounds of ammunition. The Connecticut Citizens Defense League, which is challenging the new law as unconstitutional, has been working to remind gun owners of the looming deadline. The gun-advocate group said many people are unaware of the law or its stipulations. As many as 20,000 weapons may be affected by the new reform.