ATN's X-Sight 4k scope is a major leap in their NV scope line, but the position and knurling on the zoom knob requires two fingers to turn. In a situation where speed is paramount (like you're zooming in for that shot on a hog) being able to one finger zoom is major advantage.

This upgrade slips onto the zoom knob, and maintains a low profile so it won't get snagged when moving in brush.

They work equally well in stalk, blind or stand hunting.

Knobs can be painted using a plastic primer before final color coat.

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4K Pro Focus knob

William Mclean on May 22nd 2018

It works and fits great sand 6.00 what a deal. Fast shipping.