The Founders were well aware of continuing advances in arms technology

During the 19th century, firearms improved more than in any other century. As of 1800, most firearms were single-shot muzzleloading blackpowder flintlocks. By end of the century, semiautomatic pistols using detachable magazines with modern gunpowder and metallic cartridges were available. Would the Founders be surprised by the improvements in ability to exercise Second Amendment rights? Perhaps not, given the tremendous advances in firearms that had taken place before 1791. And certainly not, given that James Madison, author of the Second Amendment, initiated a federal government industrial with the specific aim of vastly improving the quality and quantity of firearms manufacture.

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-WiscoDave