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Cold-hammer forged steel barrels such as those used on the HK416 have a service life of 20,000 to 50,000 rounds depending on the intensity of use. [ 283 ] [ 256 ] [ 285 ] A badly worn M16 barrel will cause the bullets to tumble in flight. [ 286 ]
Conventional eight groove rifling on the left, and octagonal polygonal rifling on the right. Polygonal rifling (/ p ə ˈ l ɪ ɡ ə n əl / pə-LIG-ə-nəl) is a type of gun barrel rifling where the traditional sharp-edged "lands and grooves" are replaced by less pronounced "hills and valleys", so the barrel bore has a polygonal (usually hexagonal or octagonal) cross-sectional profile.
The rifle also has an enhanced semi-auto chamber, BX-Trigger, heat-treated and nitrided CNC-machined match bolt, 16-1/8" cold hammer-forged bull free-floating barrel which is fluted to reduce weight and dissipate heat and is also threaded with a 1/2"-28 pattern to accommodate the included muzzle brake or other barrel accessories. [17]
The barrel and mandrel are rotated and hammered by power hammers, which forms the inside of the barrel. This is the fastest and often cheapest method of making a barrel, but the equipment is expensive. Hammer-forged barrels are generally not capable of the accuracy attainable with the first two methods mentioned.
The C8FTHB was quickly replaced by the C8A3, which features the same 400 mm (15.7 in) cold-hammer forged barrel and flat-top upper receiver as the C8FTHB as well as all the mid-life upgrades that appeared on the C7A2 such as the green furniture, ambidextrous charging-handle latch, magazine release and selector lever.
The barrel was designed by the German firm Lothar Walther and is cold hammer forged. The match grade fluted barrel is mounted fully floated and sports an integrated muzzle brake with a 50% recoil reduction effectiveness. The barrel features a non-conventional 305 mm (1:12 in) right-hand twist rate optimized for firing 16.2 gram (250 grain) .338 ...
The cold hammer-forged barrel has a polygonal profile while the slide is made from a solid bar of nitro-carburized steel. Following recent trends in modern pistol design, the P2000 makes extensive use of impact-resistant polymers to reduce weight and production costs.
The Tavor barrels are made from CrMoV steel and cold-hammer-forged (CHF) on the premises of the IWI factory in Ramat HaSharon. The TAR-21 barrel is 18 inches (457 mm) in length and is chrome-lined for durability and corrosion resistance. The barrel features 6 grooves in a 1 in 7 inch (178 mm) twist, or 32 calibres right hand twist rate.