This guide details a heat stress and zero shift test for AR-15 barrels, as demonstrated by Karl Kasarda and Ian McCullum on InRangeTV. The procedure involves firing cold and hot groups with specific barrels to assess accuracy under thermal load. The experts conclude that modern pencil barrels, when properly manufactured with stress relief, maintain zero even when heated, with weight being the primary differentiator for lightweight builds like the WWSD2020.
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