HK HK416 Takedown Pin Spring Features The HK HK416 Takedown Pin Spring is built to the same manufacturing standards as the original component ensuring correct fitment and consistent tension within the MR556A1 and MR762A1 lower receiver assembly that maintains positive takedown pin retention through thousands of disassembly and reassembly cycles. As a factory HK component it matches the original specification precisely preserving the smooth reliable takedown function that MR556A1 and MR762A1 owners depend on for fast tool-free field disassembly. Its factory origin guarantees the compatibility and long-term reliability that aftermarket alternatives cannot replicate on a professional-grade platform. Correct takedown pin spring tension is critical to maintaining positive pin retention and preventing unwanted movement during operation and this factory replacement ensures that function is restored to the original design specification without compromise. Simple to install using standard armorer tools it eliminates the fitment risk associated with non-factory spring replacements in a precision lower receiver assembly. For MR556A1 and MR762A1 owners and armorers who insist on factory-correct components throughout the lower receiver this takedown pin spring is the only acceptable replacement. HK HK416 Takedown Pin Spring Specifications Manufacturer: Heckler and Koch Model: HK416 Takedown Pin Spring Firearm Fit: HK MR556A1 HK MR762A1