my own script

Player = Game:GetService("Players").LocalPlayer
Mouse = Player:GetMouse()
Character = Player.Character
RightArm = Character:WaitForChild("Right Arm")

function Part(Parent, Size, Color, Material, Transparency)
    local NewPart = Instance.new("Part", Parent)
    NewPart.FormFactor = 3
    NewPart.TopSurface = 0
    NewPart.BottomSurface = 0
    NewPart.Size = Size or Vector3.new(1, 1, 1)
    NewPart.BrickColor = BrickColor.new(Color or "Black")
    NewPart.Material = Material or "SmoothPlastic"
    NewPart.Transparency = Transparency or 0
    NewPart.CanCollide = false
    return NewPart
end

function Wedge(Parent, Size, Color, Material, Transparency)
    local NewWedge = Instance.new("WedgePart", Parent)
    NewWedge.FormFactor = 3 --Custom formFactor, makes it resizeable to really small scales
    NewWedge.TopSurface = 0 --Smooth SurfaceType
    NewWedge.BottomSurface = 0
    NewWedge.Size = Size or Vector3.new(1, 1, 1)
    NewWedge.BrickColor = BrickColor.new(Color or "Black")
    NewWedge.Material = Material or "SmoothPlastic"
    NewWedge.Transparency = Transparency or 0
    NewWedge.CanCollide = false
    return NewWedge
end



function Weld(Parent, Part0, Part1, C0, C1)
    local NewWeld = Instance.new("Weld", Parent)
    NewWeld.Part0 = Part0
    NewWeld.Part1 = Part1
    NewWeld.C0 = C0 or CFrame.new()
    NewWeld.C1 = C1 or CFrame.new()
    return NewWeld
end

TheWeapon = Instance.new("Model", Character)
TheWeapon.Name = "Weapon"

--HANDLE
Handle = Part(
    TheWeapon,
    Vector3.new(0.5, 1.5, 0.5),
    "Black"
)
--HANDLE WELD
HandleWeld = Weld(
    Handle,
    RightArm,
    Handle,
    CFrame.new(0, -1, 0)*CFrame.Angles(math.rad(-90), 0, 0)
)

--BLADE PART
Blade = Part(
    TheWeapon,
    Vector3.new(0.2, 3, 1),
    "Bright red",
    "Ice"
)
--BLADE WELD
Weld(Blade,
    Handle,
    Blade,
    CFrame.new(0, 2.25, 0)
)

--BLADE TIP
BladeTip = Wedge(
    TheWeapon,
    Vector3.new(0.2, 1, 1),
    "Bright red",
    "Ice"
)
--BLADE TIP WELD
Weld(BladeTip,
    Blade,
    BladeTip,
    CFrame.new(0, 2, 0)
)

 local NewPart = Instance.new("Part", Parent)