NCSTAR VISM Pro Series Flip-Up Rear Sight

NCSTAR VISM Pro Series Flip-Up Rear Sight. Pro Series Flip-Up Rear sight is a low profile spring loaded rear backup sight that flips up and deploys with a push of a button. Rear sight folds flat to fit under the majority of scopes. Features an A2 dual aperture (large & small) that is fully adjustable for windage. Knurled windage knob makes adjusting the windage an easy task. Dimensions: 2.4 L x 1.2 W x 0.8 H Weight: 2.3 oz Aluminum main body with steel A2 dual rear aperture, windage knob, and adjustment screw. Mounts onto Picatinny Mil-STD 1913 rails, mounting tool included. US. PAT. 9976834