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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 standard model makes use of a traditional direct impingement with a 7 in (180 mm) carbine length gas system and has a cold hammer forged 4140 chrome-moly steel barrel with 1:8 in (200 mm) twist rifling and a birdcage style flash hider.
The Ruger American Rifle has a receiver made from 4140 chrome-moly bar stock and a hammer-forged, free-floated barrel with a blued black oxide finish, mounted onto a polymer composite stock. Some models are also available in a stainless steel variant.
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.
ORSIS can offer barrels manufactured using one of two rifling processes. ORSIS barrels use 416 Stainless Steel and the Button method. ORSIS SE barrels use 4140 grade Chrome-Molybdenum Steel with the Single-Point Cut Rifling process.
The new revolvers compared well in all respects in fit and finish to the best models offered by Colt and Smith & Wesson, using heat-treated, investment-cast 4140 chrome moly steel frames with a deep, highly polished blue finish. Later, Dan Wesson offered revolvers in stainless steel as well. [2]
Stainless steels, such as 416, have been shown to have a longer life than the traditional 4140 chrome/molybdenum steels used for barrels. [37] While the stainless barrels are not any more accurate than a 4140 barrel, they will maintain their accuracy longer in many applications, as they are more resistant to erosion caused by the heat of firing ...
Ordnance grade 4140 chromoly steel steel construction with a cast frame. [6] [7] ... Barrel Length: 5 in 4.25 in 3.5 in bull 5 in or 6 in 5 in 5 in Weight: 2.4 lb