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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.
Short-barrel firearms such as handguns necessitate faster-burning propellants to obtain sufficient muzzle energy, while long guns typically use slower-burning propellants. The pressure relationships between propellant chemical reactions and bullet response are described as internal ballistics .
Before the barrel can release the bullet in a consistent manner, it must grip the bullet in a consistent manner. The part of the barrel between where the bullet exits the cartridge, and engages the rifling, is called the "throat", and the length of the throat is the freebore. In some firearms, the freebore is zero as the act of chambering the ...
(4) a weapon made from a rifle if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 16 inches in length [...] A rifle is a firearm designed to be fired from the shoulder and fire one bullet at a time through a rifled barrel. [14] An SBR need not retain a shoulder stock after modification.
Oceania Defense has made three variations of the 5.56mm/.223 suppressor so far: the 556-45 Samson (an AR-15 suppressor designed to operate on semi auto Short-barreled rifle to 12.5" barrels), 556-SBR (designed for hard use on 10.5" barrel for AR-15 firearms in 5.56mm/.223 ammunition) and 556-45 Suppressor (direct thread on suppressor which ...
As described earlier in the series, putting a shoulder stock on a handgun with a barrel less than 16 inches long—notice the immediate descent into regulatory minutiae—makes it a short-barreled ...
An undisclosed amount of Short Barreled Rifles (SBR) chambered for the 5.56×45mm NATO intermediate cartridge with an 10.5 in (267 mm) barrel have been ordered by Lebanon. The existence of a Lebanese contract became apparent as a production overrun of these weapons was offered on the internet in late 2023. [47]
Like supplemental chambers, caliber conversion sleeves completely surround the new cartridge case, but cannot be ejected or fed from a magazine, so they only offer a single shot per barrel without manual extraction and reloading. The calibers supported by caliber conversion sleeves are limited by the difference between the calibers.