Makes installation of the M16 pivot pin and its detent faster and easier. Prevents loss of detents. Guides detent and spring into place and serves as a slave pin when installing the pivot pin.
AR-15, Issue:09, Page:076
Big Book Catalog, Issue:66, Page:074
SPECS: Blued steel. ¼" (6.3mm) diameter. 2½" (6.3cm) and 1½" (3.8cm) long “legs”.