Welcome. You probably don't NEED to change the gas rings as an AR will run with practically no gas rings for a period of time, but gas rings are cheap. So, if you feel like trying it, buy a couple sets of rings and replace them. The reason I say buy a couple sets is because they are cheap, and you might break or bend one on your first try. Then you'll also have spares. You can easily do it yourself with a little patience.
BTW - Nice rifle.
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