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With the caveat that rifles are as individual in their natures and preferences as people are, my experience leads to the generalization that heavy barrels do better free-floated, while thin lightweight barrels do better with some pressure at the forearm tip.
However, there are plenty of exceptions to every generalization. Try the business card-shim experiement. All it will cost you is a little time and a few rounds of ammo. If it doesn't work (and it may not), take 'em out and chuck 'em.
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