I'm not an expert here, but let me say that sounds really farfetched. The barrel extension is much beefier than the muzzle, and it's further supported by the receiver. I don't see much flex happening there. Furthermore, all barrels whip when fired, comp or no comp. I guess if it were the case, you'd see increased wear on the upper and lower lugs maybe? Also, doesn't the BCG essentially float in the upper and wouldn't that mean that it would move to align with the extension?
“You have made us for yourself, O Lord, and our heart is restless until it rests in you.” -Augustine
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