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Screw-on bubble level tube for 30mm sight with male x female threads to add to your existing 30mm front sight tube.  Comes with 2 changeable bubble vials for faster or dampened responses, depending on user preference.

Compatible with all 30mm sights using a 1-1/4 x 28 TPI thread.

Mounting tube has a lock ring, so it can be installed in any orientation, with the bubble on top, or below the iris, or with your preferred cant.

Bubble vials are 1/2 degree accuracy.  One contains oil to dampen the bubble speed, the other mineral spirits for faster response, or on cold days.

Cost is $ 35.

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