The barrel press kit. This includes the tools you need to remove and install the barrel. The two bars (bottom) are used to support the barrel or receiver when pressing, the aluminum block (left) is used to support the side of the receiver when working with the barrel pin, the barrel pin pusher (top center) is used to remove and replace the barrel pin, and the bolt with brass washer (left) is used to drive the barrel out of the trunnion.