A.R.M.S. Rear Backup Iron Sight for AR-15

Rugged aluminum and steel flip-up rear sight regulates properly with A2-height front sights and can be co-witnessed through an optic. Dual apertures are calibrated for close- and mid-range targets, simply aim through both or fold the first one down and use the second aperture. Easily mounts to a Picatinny receiver rail; locknut is retained by a safety wire, so you can’t lose it. Non-snagging lever instantly releases the spring-loaded sight into the ready position. #40L Low Profile is calibrated for 250 and 300 meter combat ranges, with windage adjustable in ¾ MOA increments per click. NSN #1005-01-575-3508.