Lever the power out, and the ratio of output to input force is given by the ratio of the distances from the fulcrum to the points of application of these forces. This is known as the "law of the lever." The mechanical advantage of a lever can be determined by considering the balance of moments or torque, "T", about the fulcrum. where F is the input force to the lever and F is the output force. The distances "a" and "b" are the perpendicular distances between the forces and the fulcrum. Since the moments of torque must be balanced, formula_3 .
Lever action Mossberg produces the 464 in centerfire .30-30 and rimfire .22. While the term "lever-action" generally implies a repeating firearm, it is also sometimes —and incorrectly— applied to a variety of single-shot or falling-block actions that use a lever for cycling, such as the Martini–Henry or the Ruger No. 1. Probably the first lever-action rifles on the market were Colt's 1st and 2nd Model Ring Lever rifles, both cap and ball rifles, produced by the Patent Arms Mfg. Co. Paterson, N.J.-Colt's Patent between 1837 and 1841. The ring-lever was located in front of the trigger. This loading-lever, when pulled, would index