Spring-loaded plunger and detent, located in the “Masterpiece” Banded Front Ramp, hold the sight blade into the longitudinal dovetail; set screw firmly locks the sight blade in place. Styles available: S-1 and S-2 - 5⁄64" (1.9mm) and 3⁄32" (2.3mm) diameter silver bead. S-3 - Sourdough/patridge front bead. S-4 - fixed silver 3⁄32" diameter bead and fold-down 11⁄64" (4.3mm) diameter Ivory bead. S-5 - 3⁄32" x 11⁄16" long red fiber optic light pipe.
Big Book Catalog, Issue:67, Page:289
New Product Supplement, Issue:565, Page:021
SPECS: Steel, blued. Base - 7⁄8" (22mm) long, S-4 is ¾" (19mm) long; 7⁄32" (5.5mm) wide. Blade - 9⁄16" (14.3mm) long. Height - shown in chart is from bottom of dovetail to top of blade. S-5 Light Pipe - 3⁄32" (2.3mm) Dia. x 11/16" (17mm) long.