The music in Meet the Sniper is a rearrangement of, or reference to, the Magnum Force theme music by Lalo Schifrin.
The Sniper drives a 1965 Land Rover Series I Camper Van, a hint to his game style.
The snipers quote about being polite, professional, and having a plan to kill everyone you meet was spoken by U.S. Marine Major General James Mattis to his troops in Iraq.
The Sniper has grand thumb wich It's caused by the bolt slamming shut and catching the thumb, typically during reloading or chambering a round.