ADVANTAGES

The 14.5-inch upper runs $650 without rail, and the DMR upper runs $820, retail. If the U.S. military took the plunge and switched, these prices would obviously come way down. (A brand-new M4 runs just over $700.) But there is more to it than swapping rifles. All the supporting industries, namely ammunition manufacturers, would have to spin up production lines. And there is the issue of all that 5.56 and 7.62 ammo and the accompanying magazines sitting in storage depots around the world. A wholesale swap to 6.5 Grendel would cost billions of dollars.

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