a set screw. The lever design allowed him to cock the rifle by spinning it around his hand. In addition, the screw could be positioned to depress the trigger every time he worked the lever, allowing for rapid fire, emptying the magazine in under six seconds during the opening credits on North Fork's main street. The trigger-trip screw pin was used in two configurations: with the screw head turned inside (close to the trigger), or more often, outside the trigger guard with a locknut on the outside (to secure its position). In some episodes, the screw was removed, when rapid-fire action was not required. When properly adjusted, the screw “squeezed” the trigger when the lever was fully closed. The rapid-fire mechanism was originally designed to keep Connors from puncturing his finger with the trigger as he quickly cycled the action of the rifle. With this modification, Connors pulling the trigger for each shot was not necessary, so he did not have to place his finger in harm's way. The rifle may have appeared in every episode, but it was not always fired; some plots did not require violent solutions (for example, one involving Mark's rigid new teacher). McCain attempts to solve as many problems as possible without resorting to shooting, yet still manages to kill 120 villains over the show's five-year run. Notably, McCain almost never carried a pistol, although he is a good shot with it, especially when he improvised a crude gunstock from a board, when facing a villain who had stolen his rifle. The rifle used on the set of The Rifleman, an 1892 Winchester caliber .44-40 carbine with a standard 20-inch barrel, was an historical anachronism, as the show was set in 1881, 12 years before John Browning had designed the rifle. It appeared with two different types of levers. The backwards, round-D-style loop was used in the early episodes. Sometimes, the rifle McCain uses has a saddle ring. The lever style later changed to a flatter lever (instead of the large loop) with no saddle ring. McCain fires 12 shots from his rifle during the opening credits - seven shots in the first close-up and five more as the camera switches to another view. The blank cartridges are shorter than standard cartridges, so the magazine can hold more of the blanks. The soundtrack contained a dubbed 13th shot, to allow the firing to end with