Here you can order four of the Brass Pin Bushings, or one set, without any other parts. These are the bushings designed to fit into the Super Lowers that support the hammer and trigger pins.
They are 0.375″ OD and 0.100″ THK. The ID is sized to fit a standard 0.156″ AR pin.
Four bushings are included.
A bushings installation tool ships with each order.