Yes, let’s definitely define “devices” under the Food and Drug Administration’s remit as broadly as possible. That way, not only firearms, but other everyday implements like electric shavers, toothbrushes, hair dryers and much, much more would also fall under their purview.
Presently, the FDA defines “devices as an instrument, apparatus, or a component intended to either diagnose, cure and treat — or “affect the structure or any function of the body of man or other animal.”
Using this definition, firearms and ammunition clearly are devices and accessories that can affect the structure or function of a body because of its ability to cause deliberate or accidental harm, [University of Florida law professor Lars] Noah wrote.
If regulated as a “device” through the FDA, this would mean that they’d have the ability to impose a national minimum age for purchasing, demand clearer storage instructions, and introduce performance safety standards.
Noah noted that while some might consider it a stretch to include firearms in this definition, the FDA is used to regular indoor tanning equipment and sunlamps.
These skin-darkening devices clearly serve primarily a cosmetic purpose, but fall under the FDA’s “device” authority because it has the ability to affect the structure or function of the body while also being an instrument.
“Guns and ammunition literally fit within FDA jurisdiction over ‘devices’ because these products unmistakably intend to affect the structure or function of the body,” Noah concluded.
For other skeptics who Noah said may argue that Congress should handle this issue and not the FDA, Noah responds by saying that Congress had their chance — and they “responded in a chaotic fashion” with disjointed state regulation and differing purchase rules.
— Andrea Cipriano in Biting the Bullet: Can the FDA Regulate Firearms?