https://estore.thecmp.org/Catalog/Item/PS099PBRSKWV
Plastic bore reflector (short) Korean War/Vietnam era, .30 cal or larger chambers. Description: US Military surplus bore reflector made of plastic (short) with mirror insice. Bore reflector when inserted in chamber will enable the individual to see the bore of the rifle. Bore reflector mirror not broken, serviceable condition. These are service grade bore reflectors. Standard S&H rates apply