This bushing allows the use of a 8 mm pin small hole SMG lower to mount to the semi auto receiver 9 mm pin hole large hole. Of a converted to semi auto lower. I have 3 kinds the steak in version will be $40 each it comes with a pin as shown plus shipping if needed.
brass and copper which fit across the whole lower will be 35 each plus shipping if applicable, they also come with a pin.
I also have a supply of used 8 mm pins I will sell for 15 a piece plus shipping if needed. The pins are used but completely serviceable they have been cleaned checked for functiondry