Nelson said the cause of the blast was under investigation and the video was to be used for an exhibit, but did not give further details. Steve Greenberg, a close friend of Preston’s and fellow tank owner, said his friend had fired rounds before and “everything worked fine.”

He said they were “testing some armor plate” when the explosion occurred. Preston was very safety-conscious, which is why the accident is even more shocking, Greenberg said. Read more.

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