Check the little nub to make sure it is smooth and even, maybe run it up and down a few times to make sure it works, give a little silicone, etc.
As long as it looks good, no reason to take that apart. If it is looking a bit weird, you can always take it apart -- carefully, and put a bit of oil in, make sure everything is fitting right.
If you put too much oil on the barrel/hopup, it will take a few hundred shots to work itself off again though.
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You'll need to partially dissemble the gun to do this.
Can't help you on that part though, I haven't owned an AK--yet.
Your manual should show you how to strip it down enough to get to the barrel and hop-up.
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