Gehmann Small Diameter to Large Diameter Adapter Bushing
Small Dia. to Large Dia. Bushing for use on older rear sights such as Redfield Olympic, International or Lyman (with 7/32" Dia. opening for sighting disc) to accept new large and European (9.5mm) Dia. shank Irises.
Note: Pictured threading into 577 adaptor. (not included)