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Carbon 15 rifles have carbon fiber upper and lower receivers which are lighter than the standard aluminum and steel construction of AR-15 receivers. Carbon 15 rifles are generally chambered in 5.56×45mm NATO/.223 Remington, [4] although Bushmaster also produced 9×19mm Parabellum versions of the pistol and carbine. [citation needed]
Barrels of XM-15 firearms have a heavy profile and are hard chrome-lined 4150 alloy steel or 416 stainless steel. [2] [4] In Bushmaster's 2016 sales brochure, all new-production XM-15s are stated to be supplied with a 4150 steel barrel. [5] The standard barrel has rifling of 1 turn in 9". [3]
With the rifle, Sauer introduced the Sauer Universal Tool, [2] also known as the Sauer Universal Key (SUK) [3] or Sauer Universal-Schlüssel (SUS) in German. This is essentially a 5 mm hex key integrated into the front sling swivel stud, and can be used to disassemble the forend, buttstock, switch barrels or adjust the trigger.
Barrel tensioning devices are a way of gaining stiffness with minimal increases in weight. They do this by placing a lightweight sleeve, often made of aluminium or a carbon fiber composite, around the barrel, and then using a nut attached to the end of the barrel to tension the barrel and place the sleeve under compression. This serves to keep ...
Thor XM408 Windrunner Blaser R93 Tactical Bor rifle. A free-floating barrel is a firearm design used in precision rifles, particularly match grade benchrest rifles, to accurize the weapon system. With conventional rifles, the gun barrel rests in contact with the fore-end of the gunstock, sometimes along the whole length.
Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.
The AR-15 rifle usually comes chambered for either the military cartridge 5.56×45mm or the .223 Remington. Because of the pressures associated with the 5.56×45mm, it is not advisable to fire 5.56×45mm rounds in an AR-15 marked as .223 Remington, since this can result in damage to the rifle or injury to the shooter. [1]
The Encore barrel list also includes shotgun barrels in 28, 20, and 12 gauge, and muzzleloading barrels in .45, .50 caliber, and 12 gauge using #209 shotgun primers. In 2007, Encore rimfire barrels became available in 22 LR and 17 HMR, featuring a unique monoblock design that required no alteration to the frame assembly.