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The new rule is a change from the agency’s previous position that it was unnecessary to register the orthotic braces with the NFA.

The attachment was initially designed as an orthotic device to assist a person with a physical disability to operate a firearm.

Joe McTernan of the American Orthotic and Prosthetic Association said such research encourages technological advancements that could someday provide real-time biofeedback for people who have lost limbs.

One girl with clubfoot, a congenital deformity, who was desperate for orthotic shoes.

But if you have a more complex issue, he added, a custom orthotic might be needed.