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Firearms Registration and Transfer Record, and 2013 data from the U.S.
Census.
only accessible list of its kind, it is not all-inclusive. NFA firearms only
include the categories regulated by The National Firearms Act of 1934:
machine guns, short-barreled rifles, short-barreled shotguns, suppressors,
destructive devices like bombs and grenades, concealable devices with the
ability to discharge a shot through the energy of an explosive, and any
firearm with a bore over half an inch that has not been determined to have a
legitimate sporting use.
meaning surveys on gun ownership come to different conclusions. For a look
at those results, check out this list.