| http://www.w3.org/ns/prov#value | - Under the original Act, NFA firearms" were machine guns, short-barreled rifles (SBR), short-barreled shotguns (SBS), any other weapons (AOW or concealable weapons other than pistol or revolver) and silencers for any type of firearm NFA or non-NFA. Minimum barrel length was soon amended to 16 inches for rimfire rifles and by 1960 had been amended to 16 inches for centerfire rifles as well.
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