This tool’s radiused face matches the end of the front sight housing taper pin to prevent damage during removal. The taper pin is removed by driving from left to right; the small end is on the left side of the barrel, the large end is on the right side!
AR-15, Issue:09, Page:076
Big Book Catalog, Issue:66, Page:074
SPECS: 4" (10.2cm) long. 3⁄32" (2.4mm) diameter tip.