Heat does many things to metal, and none of them are good when it comes to gun barrels. Throat erosion will ultimately cause degradation of accuracy after thousand(s) of rounds are fired, but depending on how fast they?re fired heat can change your point of impact in just a few minutes. Whether you?re a sportsman, competitor, or recreational shooter, everybody wants to extend the life of their rifle and maintain the highest level of accuracy. BarrelCool, the battery-powered chamber fan tested in this article for Benchmark Reviews, was designed to cut barrel cooling time in half and promote safety.