This pivot pin has a spring loaded push button that, when pushed, retracts the stainless steel detents for easy pin removal. The steel has a black oxide finish. The button also has a drilled cross hole which allows for the installation of a seal wire to prevent tampering with the guns internals. This pin is fitted with an end cap to simplify pin removal and installation. It also prevents any debris from entering the internal parts of the pin. Compatible with DPMS LR308, S&W M&P10, Black Rain Fallout 10, and PWS Mk2 Rifles. *NOTE* – these pins will NOT fit the DPMS GII .308 series rifles. The GII’s pins are a different diameter.