Annihilator
Emissary
Interesting story on a WWI sights, the Galilean Sights, never heard or saw these.
www.americanrifleman.org
An Official Journal Of The NRA | WWI Galilean Sights: An Evolution In Sniping
What are Galilean sights? More importantly, how well did they work? A group of modern collectors, historians and snipers decided to find out for themselves.