KNS Precision M10/MAC10 Push Button Take Down Pin Black. Parts are steel with black oxide finish. This take-down pin has a spring loaded push button. When pushed the three stainless steel keeper pins retract for easy pin removal. The pin is designed to replace the original two-piece front pin. Now you can quickly separate the upper and lower receivers without using an additional tool. Specifications for KNS Precision M10/MAC10 Push Button Take Down Pin: Manufacturer: KNS Precision Finish: Black Oxide Color: Black Country of Origin: USA Package Contents: KNS Precision M10/MAC10 Push Button Take Down Pin KNS Precision M10PBTD: M10/MAC10 Push Button Take Down Pin Black