TRENTON — Gov. Chris Christie has been mum for months on whether he'd sign a controversial gun-control bill that would reduce the size of ammunition magazines.

That didn't change Tuesday.

A day after the state Senate passed the measure — which would cut the permitted capacity of magazines from 15 to 10 rounds — Christie said he still hasn't decided what he'd do should it also pass the state Assembly.

"I can't tell you what I'm going to do with the bill until that bill hits my desk," the Republican governor said on his monthly radio show on 101.5-FM. "I am not going to prejudge anything that they may change into something that may be something I might consider differently than what my initial inclination might be."

The bill would make gun laws in New Jersey — already the second tightest in the U.S. — even more stringent. The measure was introduced in the wake of the 2012 Sandy Hook Elementary School shooting in Newtown, Conn. Families of the victims have visited Trenton twice to lobby for its passage.

Still, Christie, a potential 2016 presidential candidate, is facing pressure from gun-rights groups to veto the legislation. Gun advocates said the measure would not prevent more mass shootings and would punish law-abiding gun owners.

The Assembly approved an earlier version of the bill in March, but the Senate made changes and voted 22-7 on Monday to pass the new version. Now, the Assembly has to vote again, but supporters and opponents say they expect the house to pass the measure a week from Thursday, finally sending it to Christie's desk.

Christie said it's tough to get a grip on the legislation because "it continues to be a moving target."

"Who knows what changes the Assembly is going to make?" he said on the radio show. "They can’t make the decision on what they want this to be."

"It's kind of like reading a good mystery book," the governor added. "You want the end to get there quickly, but the end only gets there at the end."

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