local Neck = Character:FindFirstChild("Neck", true)
local Arm = Character:FindFirstChild("Right Shoulder", true)
local LeftArm = Character:FindFirstChild("Left Shoulder", true)

game["Run Service"].RenderStepped:Connect(function()
    if Equipped then
        local dir = (Mouse.Hit.p - Character.Head.Position).Unit
        local angle = math.acos(dir:Dot(Vector3.new(0, 1, 0))) - math.pi/2
        angle = math.min(math.max(- math.pi/5, angle), math.pi/5)
        Neck.C0 = CFrame.Angles(- angle + math.pi/2, math.pi, 0) + Vector3.new(0, Neck.C0.Y, 0)
        Arm.C0 = CFrame.Angles(- angle, math.pi/2 + math.pi/40 + math.pi/32, math.pi/36) + Vector3.new(Arm.C0.X, Arm.C0.Y,      Arm.C0.Z)
        LeftArm.C0 = CFrame.Angles(- angle, -math.pi/2 - math.pi/40, -math.pi/36) + Vector3.new(LeftArm.C0.X, LeftArm.C0.Y,         LeftArm.C0.Z)
    end
end)