KNS Precision SIG Sauer 556 Push Button Pivot Pin Black. It features KNS Precisions ball detents for easy assembly and a solid locking mechanism. This pin features a black oxide finish to match the receiver and stainless steel internals for corrosion resistance. This take-down pin has a spring loaded push button. When pushed the three stainless steel keeper pins retract for easy pin removal. Now you can quickly separate the upper and lower receivers without using an additional tool. Specifications for KNS Precision SIG Sauer 556 Push Button Pivot Pin: Manufacturer: KNS Precision Finish: Black Oxide Color: Black Additional Features: Regular Country of Origin: USA Package Contents: KNS Precision SIG Sauer 556 Push Button Pivot Pin KNS Precision SIG556PVT: SIG Sauer 556 Push Button Pivot Pin Black