Appearing Monday on CNN, Mark Kelly says he plans to turn the AR-15 in to Tucson police.
Kelly says he went to a store recently to buy a .45 caliber handgun, which he plans to keep.
He says “it’s too easy to buy an assault weapon and it really shouldn’t be.”
The AR-15 is among 157 military-style weapons that would be banned under a bill pending before the Senate Judiciary Committee.
Kelly and Giffords have been outspoken about the need for new gun-control measures.
Giffords was among 13 people wounded in a January 2011 rampage in Tucson that left six dead.