--just put this script under the tool and when weilded the left arm will go up aswell.

tool=script.Parent
while true do
	if tool.Parent.Parent.Name=="Workspace" then
		local la=tool.Parent:FindFirstChild("Left Arm")
		local ra=tool.Parent:FindFirstChild("Left Arm")
		local ts=tool.Parent:FindFirstChild("Torso")
		if la~=nil and ts~=nil and ra~=nil then
			local ls=ts:FindFirstChild("Left Shoulder")
			local rs=ts:FindFirstChild("Right Shoulder")
			if ls~=nil and rs~=nil then
				ls.CurrentAngle=rs.CurrentAngle*-1
				ls.MaxVelocity=0
			end
		end
	end
wait(.02)  --If arm looks glitchy, then make this number smaller. And avoid setting to 0(game will crash).
end	
