Remember Me? Results 1 to 9 of 9. Thread: Williams FoolProof parts and apertures. Thread Tools Show Printable Version. Stop screw - 5D only - set screw to return upper staff to same position Elevation and Windage screw lengths- The elevation knob length is not critical, since any extra length passes through the bottom of the base.
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The products of the Williams Gunsight Company, a senior citizen among firearms oriented companies, have traditionally been innovative and well respected. At the top of their line of sights is the famous "Fool Proof" line of receiver mounted aperture peep sights. Williams continues to offer two lines of traditional receiver sights.