T/C Encore and Pro Hunter Barrel Pivot Hinge Pins Encore/Pro Hunter Hinge Pins come in standard, adjustable and locking versions... This is the hinge pin that pivots the barrel downward when you open and close your Encore or Pro Hunter action. The original factory hinge pin is made from precision ground "drill rod" to fit closely for accuracy while allowing removal to swap barrels. These original pins get lost or dinged up and need to be replaced. Adjustable Hinge Pin - This is a collet style replacement pin with a screw adjustable expansion capability. It can adjust out some of the looseness your gun may have acquired after alot of use. Read more on our Adjustable Pin Page. Locker Pin - This pin is designed to remove all pin movement... side to side as well as rotational. This is an accuracy tweak to enhance the consistency of the lock-up when you close your action for shooting. Read more at our Accuracy Locker Pin Page.