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The science behind barrel heatIt really is simple to understand why your barrel gets hot. And if you know why, then understanding the cooling methods will be a lot easier as well. When you fire your AR-15 the hammer strikes a firing pin, which in turn stries the percussion cap. The percussion cap then ignites the gunpowder in the casing causing a rapid expansion of gas within the barrel, which propels the projectile forward and out. The AR-15’s...