Standard issue but not standard construction is the best way to describe the Aimpoint® CompM4S Red Dot Sight. Originally designed for military use, it mounts quickly and will light up and stay working for up to 8 years on a single AA battery. The 2 MOA red dot gives you both-eyes open targeting speed and enhanced situational awareness while the hard anodized aluminum alloy housing withstands drops, even into water depths reaching 150 feet. The QRP2 mount has twice the clamping power of previous models with a wider, shorter twist knob to lower the risk of snagging. The front lens is recessed for improved protection from impact and threaded to accept an anti-reflection device.