Internal micrometer adjustments have positive internal locks. The FP Receiver Sight is strong, rugged, dependable. The alloy used to manufacture this sight has a tensile strength of 85,000 pounds. Yet, the FP Receiver Sight is light and compact, weighing only 1-1/2 ounces. For big game hunting, the FP Receiver Sight will outsell all other makes and models of receiver sights put together. Many guns are now being drilled and tapped at the factory for installation of the FP Receiver Sight. Fits Winchester 94 Top Eject, 55, 63, 64, 65, 9422; side drilled Marlin 36, 336, 444, 44Mag, 93, 1894, 1895, 1895G pre2001. About Williams: Williams Gun Sight Company was started in 1926 by Harvey Williams as a sight manufacture. The company grew its sight manufacturing business over the years then developed a retail store and shooting ranges in Davison, Michigan. In recent years, Williams is the oldest sight company that provides sights to many different gun manufactures.