Firearms - Guides - Importation & Verification of Firearms - National Firearms Act Definitions - Machinegun | Bureau of Alcohol, Tobacco, Firearms and Explosives
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A Non-Gun-Owner's Guide to Guns – Mother Jones
What to know about machine gun laws in the US - ABC News
Assault rifle | Definition, Examples, Facts, & History | Britannica
Wal-Mart To End Sales Of Some Semi-Automatic Rifles, Citing Low Demand | NPR Article | WNYC