Primary Arms SLx MD-21 ACSS-CQB Red Dot Sight - Black

The Primary Arms SLx MD-21 is a compact, rugged micro red dot for rifles, carbines and shotguns. AutoLive motion sensing turns the dot off when the gun is set down and back on the moment it is picked up.

The ACSS CQB reticle has three BDC dots below the chevron for 600 yards of bullet drop compensation with 5.56 NATO and 7.62 NATO, plus ranging and wind leads, and the CQB horseshoe grabs the eye instantly at close range and, per the manufacturer, roughly approximates a 00 buckshot pattern at 25 yards; actual patterns depend on the gun and load. You can cycle through the full reticle or parts of it, four modes in total.

Brightness is set with top-mounted buttons, and illumination has 12 levels. It uses the standard micro dot footprint (Aimpoint Micro), and a low mount and a raised mount with spacer (36 or 39 mm centre height) are included. Co-witness with iron sights depends on their height. Lenses are fully multi-coated, and it weighs 142 g.