It's another in the series of "cool stuff" at the NRA National Firearms Museum in Fairfax, Virginia. John Popp is staring at today's gun. We may be getting into some "crazy" stuff! Firearms specialist Logan Metesh says someone wanted to go big. It's a Colt Single-Action Army that has undergone major surgery. It has an extra frame and cylinder added, then welded and brazed back together. You can load a .410 shotgun shell, but no one at the museum has been brave enough, or foolhardy enough, to try shooting it.