One-piece front base, plus a fully adjustable ghost ring rear sight for Marlin lever guns. Hunters and competitive shooters alike will benefit from the faster sighting offered by the .191" and .230" inside diameter rear apertures and .100" wide, white line front sight blade. Ghost Ring sets include a rear ghost ring sight that mounts directly to the receiver without drilling and trapping. Mfg: Xs Sight Systems SPECS: Steel, black, matte finish. 336/1894/30AS Ghost Ring Set - Fits Marlin 336, 1894, and 30AS with .700" c-to-c front ramp hole spacing.