How do I fix this issue with welds?

Alright so for some reason, when you test this in studio solo mode, it'll work just fine, but when you go into server testing alone or with others, the arms fall off and it's stopping me from getting any further. I have no idea what's wrong with this code but someone please tell me if you catch something?

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---------------- [ Variables ] --------------------------------------------------------
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local LA = char:WaitForChild("Left Arm")
local RA = char:WaitForChild("Right Arm")
local LAW
local RAW

local FRA
local FLA
local FRW
local FLW

local arms

local AnimBase
local AnimBaseW

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---------------- [ Weld Setup ] -------------------------------------------------------
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-- Set up arms model
function MakeArmModel()
arms = Instance.new("Model", cam)
arms.Name = "Arms"
end

function RemoveArmModel()
	arms:Destroy()
end

-- Making AnimBase
function MakeAnimBase()
		AnimBase = Instance.new("Part")
		AnimBase.FormFactor = "Custom"
		AnimBase.Size = Vec3(0.2, 0.2, 0.2)
		AnimBase.CanCollide = false
		AnimBase.Transparency = 1
		AnimBase.Anchored = false
		AnimBase.Name = "AnimBase"
		AnimBase.Parent = cam
		
		AnimBaseW = Instance.new("Motor6D")
		AnimBaseW.Part0 = AnimBase
		AnimBaseW.Part1 = Head
		AnimBaseW.Parent = AnimBase
		AnimBaseW.Name = "AnimBaseW"
		AnimBaseW.C0 = CF()
		AnimBaseW.C1 = CF()	
end

function RemoveAnimBase()
	AnimBase:Destroy()
end


-- Making FakeArms
function MakeFakeArms()
	
local Hum = Instance.new("Humanoid", arms)
		Hum.MaxHealth = 0
		Hum.Health = 0
		Hum.Name = ""
local Shirt = char:WaitForChild("Shirt"):clone()
	Shirt.Parent = arms
	
FRA = char:WaitForChild("Right Arm"):clone()
FRA.Parent = arms
FRA.Name = "Right Arm"
FRA.Anchored = false
FRA.FormFactor = "Custom"
FRA.Size = Vector3.new(0.8,3,0.8)
FRA.Transparency = 0

FRW = Instance.new("Motor6D")
FRW.Part0 = RA
FRW.Part1 = FRA
FRW.Parent = FRA
FRW.C1 = Settings.RightPos
 
FLA = char:WaitForChild("Left Arm"):clone()
FLA.Parent = arms
FLA.Anchored = false
FLA.Name = "Left Arm"
FLA.FormFactor = "Custom"
FLA.Size = Vector3.new(0.8,3,0.8)
FLA.Transparency = 0

FLW = Instance.new("Motor6D")
FLW.Part0 = LA
FLW.Part1 = FLA
FLW.Parent = FLA
FLW.C1 = Settings.LeftPos

BoltW = tool.Bolt.Bolt
MagW = tool.Mag.Mag
	
AimPart = tool:WaitForChild("AimPart") --tool:WaitForChild("Kobra"):WaitForChild("AimPart")

end

-- Welding real arms
function WeldRealArms()
	RAW = Instance.new("Weld")
		RAW.Part0 = AnimBase
		RAW.C0 = CFrame.new(0, -1.5, 0)
		Torso:WaitForChild("Right Shoulder").Part1 = nil
		RAW.Part1 = RA
		RAW.Parent = RA
		RAW.C1 = Settings.RealRightPos
		
	LAW = Instance.new("Weld")
		LAW.Part0 = AnimBase
		LAW.C0 = CFrame.new(0, -1.5, 0)
		Torso:WaitForChild("Left Shoulder").Part1 = nil
		LAW.Part1 = LA
		LAW.Parent = LA
		LAW.C1 = Settings.RealLeftPos	
end


-- Making Gun
function WeldGun()

end


tool.Equipped:connect(function()
MakeArmModel()
MakeAnimBase()
MakeFakeArms()
WeldRealArms()
--WeldGun()
HeadMove.Disabled = false
end)

tool.Unequipped:connect(function()
	RemoveArmModel()
	RemoveAnimBase()
	HeadMove.Disabled = true
end)