The Advanced Gun System is a 155 mm naval gun, two of which are installed in each ship. This system consists of an advanced 155 mm gun and its Long Range Land Attack Projectile (LRLAP). This projectile is a rocket with a warhead fired from the AGS gun; the warhead has an 11 kg / 24 lb bursting charge and has a circular error probable of 50 meters. This weapon system has a range of . The fully automated storage system has room for up to 750 rounds. The barrel is water-cooled to prevent overheating and allows a rate of fire of 10 rounds per minute per gun. Using a Multiple Rounds Simultaneous Impact (MRSI) firing tactic the combined firepower from a pair of turrets gives each "Zumwalt"-class destroyer initial strike firepower equivalent to 12 conventional M198 field guns. The "Zumwalt"s use ballast tanks to lower themselves into the water for a reduced profile in combat. In November 2016, the Navy moved to cancel procurement of the LRLAP, citing per-shell cost increases to $800,000–$1 million resulting from trimming of total ship numbers of the class. The Navy is monitoring research on alternative munitions, but since the AGS was tailor-made to use the LRLAP, modifications will be needed to accept different shells, which is unlikely to happen by the time the first "Zumwalt" vessel enters operational service in 2018, leaving it unable to fulfill the naval gunfire support role it was designed for.