Williams 5D-AG sight available for popular gun models Similar to the Foolproof with strength, lightweight design, and clean appearance Designed for rugged hunting with dependable accuracy Features positive locks and clear, unobstructed vision | Constructed from high-grade alloy for durability and strength Two positions for aperture holder for increased windage adjustment Uses standard thread sizes for wide aperture selection Includes standard r-3/8 x .093 aperture; other sizes available separately |