Choate Tool Ar Essential Parts Kit 223 5.56. The kit comes with an Extractor Extractor Pin Two Extractor Spring Assembly Ejector/Selector Detent Spring Selector/Safety Detent Takedown/Pivot Pin Detent Takedown/Pivot Pin Detent Spring Takedown Pin Pivot Pin Hammer/Trigger Pin and Three Bolt Gas Rings. These are the part most often lost or most often to fail on the AR platform. This kit contains most of the small parts needed to keep you AR platform weapon running in the smallest package possible. All in a kit that will fit in your grip or stock. Specifications for Choate Tool Ar Essential Parts Kit: Manufacturer: Choate Tool Color: Black Country of Origin: USA Features of Choate Tool Ar Essential Parts Kit AR Essential Parts Kit Package Contents: Choate Tool Ar Essential Parts Kit Choate Tool CMT-16-09-05: Ar Essential Parts Kit 223 5.56