Arsenal OP SCRIPT GUI

 loadstring(game:HttpGet("https://pastebin.com/raw/W0HC8XvW"))()

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GUI ABOVE


RAINBOW GUN BELOW

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local c = 1
function zigzag(X)
 return math.acos(math.cos(X * math.pi)) / math.pi
end
game:GetService("RunService").RenderStepped:Connect(function()
 if game.Workspace.Camera:FindFirstChild('Arms') then
  for i,v in pairs(game.Workspace.Camera.Arms:GetDescendants()) do
   if v.ClassName == 'MeshPart' then
    v.Color = Color3.fromHSV(zigzag(c),1,1)
    c = c + .0001
   end
  end
 end
end)