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41xx steel is a family of SAE steel grades, as specified by the Society of Automotive Engineers (SAE). Alloying elements include chromium and molybdenum, and as a result these materials are often informally referred to as chromoly steel (common variant stylings include chrome-moly, cro-moly, CrMo, CRMO, CR-MOLY, and similar).
Most Bushmaster barrels were 4150 steel, offered in 1:9 twist rate, and chrome-lined to increase durability. Some barrels were available with 1:7 rifling on special order. Stainless steel or chrome molybdenum barrels were available on certain models.
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]
The upper receiver is a one-piece tube with a screwed in match barrel. Goncz Armament utilized heat treated 4130 solid chrome alloy for the receiver tube. On the Goncz GA and Claridge T and L models, and all rifles, it also acts as a barrel shroud. The receiver tube houses the bolt, guide rods and guide springs.
The SAE steel grades system is a standard alloy numbering system (SAE J1086 – Numbering Metals and Alloys) for steel grades maintained by SAE International.. In the 1930s and 1940s, the American Iron and Steel Institute (AISI) and SAE were both involved in efforts to standardize such a numbering system for steels.
Chromium–vanadium steel (symbol Cr-V or CrV; 6000-series SAE steel grades, often marketed as "Boss AA" [1] ...
Has lower molybdenum content than ATS-34, is less wear-resistant than ATS-34 and has been reported to be also less rust-resistant than ATS-34. [7] BG-42 is Slightly higher in carbon, chrome, and moly than ATS-34. Must be forged and heat-treated at very high and exact temperatures. Can be used at very high hardness, such as RC 64–66.
The REC7 rifle's forged 7075 aluminum upper and lower receivers are Type 3 hardcoat anodized. The lower houses an ultra-dependable single-stage trigger. The upper supports a free-floated, hammer-forged, chrome-lined barrel with M4 feed ramps machined into the receiver and the barrel extension. A mil-spec A2 flash hider protects the muzzle. [3 ...