US Army Considers Adopting an Interim Battle Rifle in 7.62NATO: eventually adopt 6.5

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It goes both ways. The Germans are putting a 5.56 on their new Puma IFV, not a 7.62. And since the Puma weighs in at 30+ tons and has a 1000 horsepower engine that extra 2or3 pounds they are saving will be irrelevant compared to the loss of capability.