Rifleman’s aim improver

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Possible Answers: SCOPE.

Random information on the term “SCOPE”:

John Thomas Scopes (August 3, 1900 – October 21, 1970[1]) was a teacher in Dayton, Tennessee, who was charged on May 5, 1925 for violating Tennessee’s Butler Act, which prohibited the teaching of evolution in Tennessee schools. He was tried in a case known as the Scopes Trial.
Taken from Wikipedia