Can someone help me, as I'm trying to change a gun's script to a raycasting function? [closed]

Hello, I'm Bladeor, and I am making a game called Mutiny. I need scripting help with a weapon I acquired from a friend. I need someone to help me change this function from a spawn a part and throw it forward script to a raycasting script. This is because this script works in Studio, but not in actual gameplay after I upload it.

Here is the function part of the script. There is much more script above and below it.

function fire(v)


    Tool.Handle.Fire:play()


    local vCharacter = Tool.Parent
    local vPlayer = game.Players:playerFromCharacter(vCharacter)

    local missile = Instance.new("Part")



    local spawnPos = vCharacter.PrimaryPart.Position



    spawnPos  = script.Parent.Shot.Position

        local spawnPos = vCharacter.Musket.Flame.Position

    spawnPos  = spawnPos + (v * 200)



    missile.Position = spawnPos
    missile.Size = Vector3.new(1,1,1)
    missile.Velocity = v * 800
    missile.BrickColor = BrickColor.new("Bright Blue")
    missile.Shape = 0.5
    missile.BottomSurface = 0
    missile.TopSurface = 0
    missile.Name = "Paintball"
    missile.Elasticity = 0
    missile.Reflectance = .1
    missile.Friction = .3


    local force = Instance.new("BodyForce")
    force.force = Vector3.new(0,100,0)
    force.Parent = missile


    local force = Instance.new("BodyForce")
    force.force = Vector3.new(0,missile:GetMass() * 1,0)
    force.Parent = missile

    local mesh = Instance.new("SpecialMesh")
    mesh.Scale = Vector3.new(.2,.2,.2)
    mesh.MeshType = "Sphere"
    mesh.Parent = missile

    local new_script = script.Parent.Bullet:clone()
    new_script.Disabled = false
    new_script.Parent = missile

    local creator_tag = Instance.new("ObjectValue")
    creator_tag.Value = vPlayer
    creator_tag.Name = "creator"
    creator_tag.Parent = missile



    missile.Parent = game.Workspace