Description
Upgraded back block for the F6 Twister autococker that matches up to the body perfectly.
This back block is made to EVO specifications. The pump arm threads are longer and beefed up. There is enough meat that it can be heli-coiled if the threads ever get buggered up and enough room that you can use a set screw to lock the back block in position on the pump arm. The bottom of the back block has a more rounded proflile than the stock one.
