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The shank length is not always the same at the thread length, which is the case if the insert has a threadless portion (sub-shank) Tenon designates the thread length; Shoulder designates the barrel diameter in front of the thread portion; Unless otherwise mentioned, right hand threads are assumed. Left hand threads are designated "LH".
Right: Threaded barrel without choke insert. (For illustration only; a threaded barrel must never be fired without a properly inserted choke tube.) The marking is usually stamped on the underside of the barrel for older guns without choke tubes, or is spelled out in abbreviated text on the barrel near the gauge marking.
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.
An 18-inch (457 mm) (MOD 0/1) or 16-inch (406 mm) (MOD H) threaded-muzzle match-grade free floating stainless steel heavy barrel with a 1:7 (178 mm) rifling twist ratio is standard for the SPR. [11] [3] [13] The barrels are manufactured by Douglas Barrels with a unique contour that reduced weight but maintained rigidity for accuracy. [14]
For firearms having a rifled barrel, the bullet typically extends forward from the leading edge of the cartridge case. The portion of the barrel forward of the chamber that provides clearance for the loaded bullet of a cartridge is known as the throat. The throat is composed of both a freebore and a leade. [6]
The AWS barrel/suppressor combination has a total length of 711 mm (28 in), which keeps the weapon's overall length within normal limits. The user can remove the barrel/suppressor combination and replace it with a standard AW or AWP barrel in about three minutes. [23] As with all such systems, the sight will need re-zeroing after a barrel change.
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.
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.