How to make a gun fire like a shotgun?

I'm trying to make a gun fire three different bullets in a fashion similar to a shotgun, but I can't figure it out. What should I do to this script to get it to work?

local Tool = script.Parent

enabled = true

function fire(v)

    local vCharacter = Tool.Parent
    local vPlayer = game.Players:playerFromCharacter(vCharacter)
    local Torso = vCharacter.Torso
    local spawnPos = Torso.Position
    spawnPos = spawnPos + (v * 3)
    for i = 1,3 do
        local missile = Instance.new("Part")
        missile.Position = spawnPos
        missile.Size = Vector3.new(0.6,0.6,0.6)
        missile.Velocity = v * 300
        missile.BrickColor = BrickColor.new("Dark stone grey") 
        missile.Shape = "Ball" 
        missile.BottomSurface = "Smooth" 
        missile.TopSurface = "Smooth" 
        missile.Name = "Bullet" 
        missile.Elasticity = 0
        missile.Reflectance = 0
        missile.Friction = .9
        missile.Parent = game.Workspace
        local DmgScript = script.Parent.BulletDamage:Clone()
        DmgScript.Disabled = false
        DmgScript.Parent = missile
        local Delay = script.Parent.DelayedRemover:Clone()
        Delay.Disabled = false
        Delay.Parent = missile
        local force = Instance.new("BodyForce")
        force.force = Vector3.new(0,100,0)
        force.Parent = missile
    end
end

function onActivate()
    if enabled == true then
        enabled = false

        local character = Tool.Parent
        local humanoid = character.Humanoid


        local targetPos = humanoid.TargetPoint
        local lookAt = (targetPos - character.Head.Position).unit
        script.Parent.Handle.Sound:Play()
        fire(lookAt)
        wait(0.6)
        enabled = true
    end
end

script.Parent.Activated:connect(onActivate)