This is a weapon that fires multiple projectiles:

   <Weapon
      fireRate=             "15"
      powerUse=             "10"
      >

      <Missiles>
         <Missile
            ammoID=               "&itAmmo1;"

            type=                 "missile"
            damage=               "kinetic:1d6+1; momentum1"
            missileSpeed=         "40"
            interaction=          "80"
            lifetime=             "60"
            sound=                "&snRecoillessCannon;"
            >

            <Effect>
               <Bolt
                  length=            "16"
                  width=             "3"
                  primaryColor=      "0xcd, 0xf3, 0xff"
                  secondaryColor=    "0x8f, 0xa9, 0xb2"
                  />
            </Effect>
         </Missile>

         <Missile
            ammoID=               "&itAmmo2;"

            type=                 "missile"
            damage=               "kinetic:1d6+1; momentum1"
            missileSpeed=         "40"
            interaction=          "80"
            lifetime=             "60"
            sound=                "&snRecoillessCannon;"
            >

            <Effect>
               <Bolt
                  length=            "16"
                  width=             "3"
                  primaryColor=      "0xcd, 0xf3, 0xff"
                  secondaryColor=    "0x8f, 0xa9, 0xb2"
                  />
            </Effect>
         </Missile>
      </Missiles>
   </Weapon>