Steel pin replaces original pin and locks into place against the take-down pin on M16/M4 rifles to prevent rotation and wear on receiver holes. Drop-in installation requires no tools or gunsmithing.
AR-15, Issue:08, Page:022
Big Book Catalog, Issue:65, Page:022
New Product Supplement, Issue:573, Page:007
SPECS: Steel, matte black phosphate finish. Fits M16/M4 receivers only.