BSC300233 Features: -The FastFire II provides the only fully waterproof unit in its product category. -The FastFire sight is very small, mounts very low, and weighs a mere 1.6 ounces. -And it has repeatedly proven it's toughness on the slides of high power semi-autos, on slug guns, on shotguns and on high power rifles. -The FastFire housing is made of metal for strength and durability. Product Type: -Holographic Sights..