This large hole receiver pivot pin is designed for quick and easy removal. 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.