ROMEO4 is the ultimate red-dot sight when fast, accurate target acquisition is a must. Whether it?s a moving target, dangerous game at full charge, or a fast breaking tactical situation at close quarters. When things are moving fast and you need to get on target in a hurry, your sight has to work faster. No matter the lighting conditions, weather conditions, or terrain, the ROMEO4 red-dot sight has you covered-?when it counts. You can shoot with confidence with both eyes open, on target yet aware of the situation at all times as it unfolds. And because it is a SIG SAUER(R), you know the ROMEO4 is as tough and dependable as our firearms. Designed for modern semi-automatic pistols, MSR platforms and shotguns Comes standard with solid and see-through lens covers and hex bolt mount Ballistic Circle-Dot reticle Users can select from 4 different integrated reticle options (Dot, Circle-Dot, Dot with Holds, Circle-Dot with Holds) 50,000+ hour battery life and the readily available CR2032 battery is side loading for quick battery replacement