Older short action, pre- '07 IIRC.
The O-rings act as a deresonator, been around forever...here's the Limbsaver model:
http://www.cabelas.com/product/Sims-...tor/741294.uts
They're designed to affect/dampen barrel harmonics. Obviously in your case they're not causing any detriment to accuracy, you can always note their position for replacement, remove them and see what effect they have. Usually barrels are better served being completely free-floated, but absent acceptable results deresonators, and tuners (an adjustable muzzle device) are used.
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