Heckler and Koch HK416 Receiver Extension Nut

Overview

HK HK416 Receiver Extension Nut Features The HK HK416 Receiver Extension Nut is machined from steel to HK s exacting manufacturing tolerances delivering the precise fitment and long-term durability that the MR556A1 platform demands under sustained use and varied field conditions. As a factory HK component it interfaces correctly with the MR556A1 s lower receiver and stock assembly without modification maintaining the tight rattle-free fit that defines HK s build quality. The matte black finish resists corrosion and blends seamlessly with the MR556A1 s existing hardware for a clean factory-correct appearance. Designed as a direct replacement for the original component this receiver extension nut restores full structural integrity to the stock attachment point with no fitting or gunsmithing required. Its steel construction ensures it stands up to the repeated stress and torque cycles of regular use without deforming or loosening over time. For MR556A1 owners in need of a reliable factory-spec replacement this is the only part worth installing. HK HK416 Receiver Extension Nut Specifications Manufacturer: Heckler and Koch Model: HK416 Receiver Extension Nut Material: Steel Color: Black Firearm Fit: HK MR556A1