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If the nameless retailer is the one I think it is, that AK is likely older stock being blown out and almost certainly has an M140 in it, and should be downgraded.
Springs are cheap and having an extra around is always a good thing, so even if you end up not needing to use it you haven't wasted anything.
As said previously, a good shim and lube job is probably all you need to do. Easy to accomplish if you're swapping the spring anyway.
It's a good idea to pull the inner barrel and hopup chamber out of the gun and check to see that everything is aligned properly, but that's it really.
You can think about replacing the compression system, gears, and motor sometime, but I wouldn't worry about that until it breaks.
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