Airsoft is an activity used primarily for recreation or sport wherein replica firearms shooting 6mm or 8mm plastic rounds are used for personal collection, gaming (similar to Paintball), or professional training purposes (Military Simulations and Police training exercises). A primary difference between airsoft firearms and BB guns is that the former uses plastic bullets and have muzzle velocities of less than 500 feet per second (FPS) on average, which is generally considered safe when used in a controlled environment, while the latter utilizes metal ammunition and shoots at higher velocities (up to, and over 1000 FPS), making them unsuitable for gaming and training purposes. Airsoft games vary greatly in style and composition depending on location, budget, and the quantity of participants but often range from short-term skirmishes and organized scenarios to military simulations and historical reenactments. Combat situations on the battlefield often involve the use of common military tactics to achieve the objectives set in each game. Participants typically use varying types of airsoft weaponry along with either real or replica military gear and uniforms.