Replaces your standard trigger and hammer pin, and adds anti-rotation links provide the strongest possible system to help eliminate pin rotation, wear to receiver holes, and pins walking out. This can be common with 9mm and .22LR conversions, suppressor use, M16/Full Auto lowers, and out-of-spec or homebuilt recievers.  Notched hammer pin locks into slots in the anti-rotation links while the trigger is secured with locking screws, and includes lube ports so adequate lubrication reaches the trigger. Anti-rotation links fit on the outside of the receiver to prevent all movement. Pins are CNC-machined, centerless ground for uniformity and heat treated for durability. Available in standard .154"