If you’re a few years older than me, you might have owned a cap gun version of the Mare’s Leg from Wanted Dead or Alive (1958-1961). Today, if you must, you can buy firing replicas of Steve McQueen’s cut-down Winchester Model 92. Besides the recoil of such a gun and the pointlessness of turning a rifle into a pistol, the real reason the Mare’s Leg makes the list is, the gun and ammo don’t match. The rifle is a .44-40, but the small cartridges didn’t look impressive enough in the gun belt on camera, so McQueen wore .45-70 shells instead.