http://www.gizmag.com/go/6254/
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Caught this article at gizmag where it states: "The platform, made of a combination of high-strength steel and aluminum, incorporates a cannon assembly that is 1,200 pounds lighter than the M777 cannon used on the NLOS Cannon Concept Technology Demonstrator previously developed and tested by BAE Systems."
Take a look at the pictures. The tube walls at the muzzle seem incredibly thin.
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