he HHA Tetra XB Crossbow Scope Mount allows you to use a single crosshair, variable magnification scope and adjust the angle of the scope to the distance of your animal. that way you only have to deal with one crosshair and it will adjust out to 100 yards with pin point precision. This HHA Optimizer scope mount bolts to most crossbow scope rails (occasionally some filing of the mount lock will allow for tightening on narrow rails) and can be used with scopes as well as red dots.
The key to use it on a crossbow is a scope with either an adjustable, short, or infinite parallax. Long range rifle scopes with long parallax will cause accuracy issues at long range if you move your head around at all on the stock.
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