I shoot 3-gun regularly and I don't quite agree with you. The polymer lowers are being bought in desperation right now. Very few of them will be used in 3 gun competition, and for good reason. They do not have the durability of a forged lower, and due to their weight (or lack thereof) leave a rifle very unbalanced. Many 3-gunners use uppers with 18"-medium contour barrels, with handguards up to 16" in many cases. This means that some additional weight in the rear is necessary to keep the rifle swinging well.
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