1 Mile Airgun World Record-Behind the Scenes-MOA Booster 

Demonstration of the function of the MOA Booster - a periscopic device that changes the optical inclination of the riflescope.
The same device was used to achieve the World Record for the longest hit from Airgun a 1 MOA target at one mile !
The record itself can be viewed here: • 1 Mile - World Record ...
RU-vid Audio Library :
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Pentagram by Audionautix