Williams Gun Sight Company FP Receiver Peep Sight For Marlin 336 | 70222 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 rifles are now being drilled and tapped at the factory for installation of the FP Receiver Sight. Made from Aircraft grade aluminum these lightweight, durable sights will serve you for years to come. Image is a stock photo, which shows the quality of construction and the general appearance of Williams Sights. The actual item for sale may differ in appearance to provide the proper fit and function.