BLACKHAWK! AR Fixed Back Up Iron Sight Same plane Aperture with no Vertical or Horizontal point-of impact shift when switching from precision to CQB Compatible with Mil-Spec front sights 6061-T6 aluminum main body with type-iii hard coat finish Steel components feature durable manganese phosphate finish Large clamp for stable attachment Same plane aperture with no vertical or horizontal point-of impact shift when switching from precision to CQB Compatible with MIL-spec front sights Made of 6061-T6 aluminum main body with Type-III hard coat finish Steel components feature durable manganese phosphate finish Large clamp for stable attachment