The sights you choose to use on your weapon can have a profound impact on how well you perform at the range. More importantly, good sights can make a huge difference if you find yourself in a tactical engagement. Though there are plenty of newer solutions out there, few compare to the reliability and reputation of the Aimpoint CompM4 Red Dot Sight.
Originally launched in 2007, the CompM4 has been providing tactical shooters with an option they could count on for years now. It features 9 daylight operational setting and 7 NVD options, which helps ensure you are ready under any lighting conditions. With a single AA alkaline battery powering the sights, it makes it easy to keep it charged and ready. The durable design allows it to be fully submerged up to 150 ft., ensuring that you can take it with you under virtually any conditions. Its extreme temperature tolerance and low profile design also aide in stealth operations.
If you want the best optics for your firearms, then this CompM4 from Aimpoint is a great place to start.