Designed for use on slim and standard-sized pistols, the Aimpoint COA 3.5 MOA Red Dot Reflex Sight with Integrated A-Cut Interface blends easy operation and superior reliability in an ultra-compact design. The COA features a high-strength aluminum frame and an enclosed emitter, so it's ready for everyday carry. In fact, it's been tested to withstand 40,000 rounds of 9mm so it'll hold zero on your handgun through thick and thin. Optics are completely enclosed, never to be blocked by rain, snow, or dust. Other features include a 3.5 MOA dot with 8 daylight and 4 night-vision brightness settings. Over 50,000 hours of constant-on use on one 2032 battery (included). 100% waterproof and submersible to 82 feet. NOTE: Slide must feature an A-Cut interface for proper mounting. Designed for use on slim and standard-sized pistols Easy operation Enclosed-emitter design is impervious to elements High-strength 7075-T6 aluminum frame Tested to withstand 40,000 rounds of 9mm ammo 3.5 MOA dot with 8 daylight and 4 night-vision brightness settings Over 50,000 hours of operation on one 2032 battery 100% waterproof and submersible to 82 feet