Washington (CNN) - Commander Mark Kelly and his wife, former Congresswoman Gabby Giffords, were such gun enthusiasts, they used to go together to the NRA practice range outside of Washington, Kelly tells CNN.
He even says he considered joining the NRA, but "never got around to it."
Now, Kelly is preparing to take on the powerful gun lobby at the first congressional hearing on gun violence since December's massacre in Newtown, Connecticut.
In a telephone interview, Kelly told CNN he will tell members of the Senate Judiciary Committee that he and Giffords are "both moderate gun owners and strong supporters of the Second Amendment, but we really need to do something about the safety of our kids and our communities. It's gotten really out of hand."
Kelly says he has never met the other star witness at Wednesday's hearing, NRA Executive Director Wayne LaPierre, but says he looks forward to it because he believes there are probably some things they could agree on right now.
"The NRA does some really good things. They teach people about gun safety, how to handle a firearm – a lot of what the NRA does is really positive," said Kelly.
But these days, they disagree more than they agree.
"You would think with my background I would be a member of the NRA. I own a gun. I recently bought a hunting rifle a few months ago. I went through a background check. It took I think about 20 minutes. It's a small price to pay to make us safer. We're not going to stop every one of these mass shootings. We're not going to stop every murder with a handgun in our cities, but I think we'd go a long way to reducing the violence and preventing some," said Kelly.
Kelly, a retired astronaut and 25 year veteran of the Navy, is now pushing gun control through a new organization he recently started with Giffords called Americans for Responsible Solutions, which has both a lobbying arm of its own and a super PAC to raise unlimited funds for its cause.
Kelly tells CNN he and his wife have not yet endorsed any legislation, but he certainly sounded supportive of not only universal background checks, but also much of what is in Sen. Dianne Feinstein's bill to revive the expired assault weapons ban.
"We are going to work to pass some reasonable gun violence legislation that addresses universal background checks, closing the gun show loophole and helping with mental health issues, and banning high capacity magazines, and both Gabby and I are of the opinion that semi automatic assault weapons should be left for the military to use," said Kelly.
"I spent 25 years in the Navy. I'm well aware of the capability of some of these guns, especially when combined with a high capacity magazine, they're great at killing a lot of people very quickly and that should be left for the military," he argued.
"We shouldn't have to deal with assault weapons on our streets."