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As has been mentioned, you can change the upper Bob, and have your AR do about any task you need.
Here is my Son's Colt HBAR. By changing the parts, it goes from a target/hunting rifle, to a homeland defense rifle.
He stayed with 5.56 for both, but you certainly don't have to. You could easily have a .260 Remington hunting upper, and a 5.56 defense lower.