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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).
The AR-30 features a 5-round detachable box magazine. The weight is 12 pounds empty. It includes a 26-inch chrome-moly barrel, 6-groove, RH 1:10-inch twist, and 48 inches overall length. The receiver is modified in octagonal form, drilled, and slotted for a scope rail. The bolt is a dual front locking lug.
Nitriding alloys are alloy steels with nitride-forming elements such as aluminum, chromium, molybdenum and titanium. In 2015, nitriding was used to generate a unique duplex microstructure in an iron-manganese alloy ( martensite - austenite , austenite - ferrite ), known to be associated with strongly enhanced mechanical properties.
Barrel: A medium heavy barrel, 22” or an optional 18” length, of chrome moly 4140 steel; Rifling: A right-hand rate of twist of 1 in 10" with 4 lands and grooves. Stock: A USGI synthetic stock modified by Smith Enterprise with an attachable SEI cheekpiece. Optics: Leupold Mk4 Tactical × scopes.
Chromium nitride is a chemical compound of chromium and nitrogen with the formula CrN. It is very hard, and is extremely resistant to corrosion.It is an interstitial compound, with nitrogen atoms occupying the octahedral holes in the chromium lattice: [2] as such, it is not strictly a chromium(III) compound nor does it contain nitride ions (N 3−).
Barrels and shrouds were constructed of chrome moly steel. Despite the success of the revised design and new caliber offerings, Dan Wesson Arms experienced significant upheaval and ownership changes after Wesson's death in 1978. The original Monson facility and production equipment became outdated, and production costs of the gun reduced profits.
Molybdenum nitride (Mo 2 N) is a binary inorganic compound composed of molybdenum and nitrogen. It belongs to the family of transition metal nitrides and exhibits properties that make it useful in applications such as a catalyst and a coating material.
This was particularly true in the 1950s to early 1960s, with the chrome moly steels almost universally used for barrels then. But recent advances with stainless steel barrels, especially with cryogenic treatment , have extended barrel life considerably with the .264 Win. Mag. and many other cartridges.