These are the most commonly used missile launcher, used by many civilian and police ship builders to add self contained ready firepower to a ship.
Each launcher can take three 'packs' of missiles, rockets, flares or mines, which are loaded and interfaced with the launchers power and data feeds.
When a weapon is fired it is powered up, armed and ejected from the pack using a simple magnetic accelerator. Once free of the ship, its internal systems come on line, and the missile is armed.