Bob Mokos is a passionate gun owner who on the surface would seem like a card-carrying National Rifle Association member.

The retired airline pilot has been shooting guns since he was a child. The Vietnam veteran got more serious about firearms as a civilian after one of his sisters was fatally shot during a mugging in Chicago. After the 9/11 terror attacks, he became qualified to carry a gun in the cockpit.

But Mokos has grown so disillusioned with the NRA over the years that he has joined forces with a rival organization — the gun control group founded by former Rep. Gabrielle Giffords.

"The...