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  2. Short-barreled rifle - Wikipedia

    en.wikipedia.org/wiki/Short-barreled_rifle

    Short-barreled rifle (SBR) is a legal designation in the United States, referring to a shoulder-fired, rifled firearm, made from a rifle, with a barrel length of less than 16 in (41 cm) or overall length of less than 26 in (66 cm), or a handgun fitted with a buttstock and a barrel of less than 16 inches length.

  3. ArmaLite AR-7 - Wikipedia

    en.wikipedia.org/wiki/Armalite_AR-7

    Because the U.S. 1934 NFA regulations set the minimum rifle barrel length at 16 inches (410 mm), Charter Arms made the barrels of the Explorer I rifle and Explorer II pistol non-interchangeable to prevent installing the pistol barrel on the rifle. The AR-7 barrel has an alignment lug that mates a notch in the receiver.

  4. The ATF Is an Arbitrary Regulator - AOL

    www.aol.com/news/atf-arbitrary-regulator...

    Yes, a rifle with a 12-inch barrel is easier to conceal than the same rifle with a 16-inch barrel, but neither is as easy to stuff into the glovebox or down your pants as an old-fashioned pistol.

  5. Bushmaster M4-type Carbine - Wikipedia

    en.wikipedia.org/wiki/Bushmaster_M4-type_Carbine

    Bushmaster also produces the Patrolman's Carbine variant which features the more common removable "bird cage" flash suppressor, attached to a 16 in (410 mm) barrel, bringing the total barrel length to 17.5 in (440 mm). Both of these comply with current U.S. federal law which states a minimum 16 in (410 mm) barrel for a rifle. There is also a ...

  6. Caliber (artillery) - Wikipedia

    en.wikipedia.org/wiki/Caliber_(artillery)

    The length of the barrel (especially for larger guns) is often quoted in multiples of the caliber, used, for example, in US naval rifles 3 in (76 mm) or larger. [2] The effective length of the barrel (from breech to muzzle) is divided by the barrel diameter to give a dimensionless quantity.

  7. 3D printers turn regular guns into machine guns. Feds are ...

    www.aol.com/3d-printers-turn-regular-guns...

    Personally made firearms that fire one shot at a time are legal, as is 3D printing certain guns as a hobbyist. But further manufacturing faces a key legal test in October when the Supreme Court ...

  8. National Firearms Act - Wikipedia

    en.wikipedia.org/wiki/National_Firearms_Act

    The National Firearms Act (NFA), 73rd Congress, Sess. 2, ch. 757, 48 Stat. 1236 was enacted on June 26, 1934, and currently codified and amended as I.R.C. ch. 53.The law is an Act of Congress in the United States that, in general, imposes an excise tax on the manufacture and transfer of certain firearms and mandates the registration of those firearms.

  9. United States v. Thompson-Center Arms Co. - Wikipedia

    en.wikipedia.org/wiki/United_States_v._Thompson...

    The legal dispute in United States v.Thompson-Center Arms Company arose when officials from the U.S. Bureau of Alcohol, Tobacco, and Firearms contacted Thompson Center Arms informing them that the kit of the Contender Pistol that included a stock and a 16-inch (410 mm) barrel constituted a short-barreled rifle under the National Firearms Act.