KNS Precision AR15/M16 .315 Diameter Push Button Pivot Pin Black. This pin is .315 in diameter and fits the AR-15 and M-16. The pin material is steel with a black oxide finish. This pivot pin has a spring loaded push button. When pushed the stainless steel keeper pins retract for easy pin removal. The pin is designed to eliminate wear in and around the hole caused by pins with spring loaded balls. The button also has a drilled cross hole which allows for the installation of a seal wire to prevent tampering with the guns internals. Specifications for KNS Precision AR15/M16 .315 Diameter Push Button Pivot Pin: Manufacturer: KNS Precision Finish: Black Oxide Condition: New Trigger Pin Size: 0.315 Color: Black Fabric/Material: Steel Country of Origin: USA Package Contents: KNS Precision AR15/M16 .315 Diameter Push Button Pivot Pin KNS Precision PBPIVOT315: AR15/M16 .315 Diameter Push Button Pivot Pin Black