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I had a couple of AK's that had them installed, and both had problems until they were removed. The trouble with them was they were limiting the carriers travel and causing short stroking issues. They also tend to get chewed up, which has the potential for issues with pieces getting into places they dont belong, causing function issues.
If they were needed, they would come with one from the factory, which they dont.
As was mentioned, if the carrier is impacting the rear of the receiver, you have other issues that need addressing. Ive owned a number of AK's over the years, and none of them ever showed any signs of battering or impact from the carrier.
One thing to consider, without the buffer present, the carrier normally doesnt impact the receiver at all, and doesnt transfer any energy to it. With the buffers installed, they do, even if the buffer is absorbing some of that energy. Not sure how that translates as far as wear goes, but it seems to me, no impact is still better than any impact.
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