Offering Aimpoint quality at a wallet-friendly price point, the ACO is a red-dot sight that provides absolute cowitness with standard AR-15 iron sights. The waterproof and shockproof ACO features a 2-m.o.a. reticle, 30 mm sight tube, anodized aluminum housing, nine brightness settings and a 10,000-hour constant-on battery life in a unit that weighs only 6.7 ozs. Price: $395. Contact: Aimpoint Inc.; (703) 263-9795; aimpoint.com.