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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 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.
Unlike drop-hammer forging, press forges work slowly by applying continuous pressure or force. The amount of time the dies are in contact with the workpiece is measured in seconds (as compared to the milliseconds of drop-hammer forges). The main advantage of press forging, as compared to drop-hammer forging, is its ability to deform the ...
In fact, it was a process created specifically to extend the life of gun barrels by reducing the effects of wear. Cold-hammer forged machine gun barrels were mass-produced during World War II for the air-cooled MG 42 general-purpose machine gun which very high 1,200 to 1,500 rounds-per-minute cyclic fire rate imparted significant heat stress ...
The quick-change barrel used in the AUG is cold hammer-forged for increased precision and durability, its bore, chamber and certain components of the gas system are chrome-plated (currently nitride on US market rifles). The standard rifle-length barrel features 6 right-hand grooves and a rifling twist rate of 228 mm (1:9 in).
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 factory barrel is either stainless or blued depending on the receiver. The action threads are imperial with 1"-16 TPI threads (in metric designation M25.4 x 1.588 mm). All factory barrels for Sako 85 are cold hammer forged , and can be delivered in various lengths, profiles and rifling twists, with or without iron sights, and either with a ...