Two parents whose children were killed at Sandy Hook Elementary School were in New Jersey Monday with lawmakers to renew efforts to pass legislation that would reduce the legal capacity of ammunition magazines from 15 to 10. 

The measure passed in the New Jersey Assembly last year but never came for a vote in the Senate after Senate President Steve Sweeney balked at allowing it to come up for a vote. But Sweeney has since had a change of heart and now supports the measure.

Proponents say the measure say it would help curb gun violence. But opponents dispute that claim, saying it would only infringe on gun owners’ constitutional rights.