Mmmm. Let me propose another possibility behind this:
Suppose the sponsor of this acknowledges the fact that the MSR (AR15) is the most popular rifle/firearm in use TODAY (sure, there have been several other firearms that have earned their place in history, but not necessarily in popular use today - at least not at the AR15 level). Let's continue to suppose that this sponsor is well aware of the attacks against and proposals to ban the MSR so by having it officially recognized as the "National Gun of the United States", it may be a way to prevent citizens from being prohibited from owning/possessing MSR's.
Just a consideration for what may be behind this effort.
Ginsue - Admin
Proud Infidel Since 1965
"You can't spell genius without Ginsue." -Ray1970, Apr 2020
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