Magwell Conversion Block - Steel with matte black oxide finish and aluminum with matte black, hardcoat anodized finish. Fits CAR-15/M4 collapsible stock models with .154" diameter receiver pin holes.
AR-15, Issue:08, Page:007
Big Book Catalog, Issue:65, Page:007
Law Enforcement / Police Store, Issue:08, Page:003
New Product Supplement, Issue:593, Page:001