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Forged Steel Receivers vs Cast Steel Receivers |
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sleeplessnashadow
Admin Group Joined: Nov 09 2015 Location: SoCal Status: Offline Points: 1150 |
Topic: Forged Steel Receivers vs Cast Steel Receivers Posted: Mar 06 2017 at 8:38am |
Forged Steel Receivers
First things First:
This is the most common terminology found in metallurgical textbooks. USGI and Commercial Forged Steel Receivers: In the true metallurgical sense, a billet is a semi-finished steel mill product. Gun receivers are not milled directly from a billet. The bar stock (rolled from a billet) is first hot forged to a basic shape then annealed (softened) to get a proper grain size to ensure a surface that can be properly and accurately machined.
There are a variety of different types and means of casting. The one most common for firearms is Investment Casting, also referred to as Lost Wax Casting. Investment Cast Steel Receivers
Each method has its Benefits & Disadvantages but both methods can produce quality receivers capable of handling the forces exerted on a firearm receiver. The metal alloy most commonly used in the manufacture of M1 carbine receivers, both forged and cast, is 4140 steel. The Question of Quality and Strength isn't Forged vs Cast, it's:
Arguments for and against Forged vs. Cast sometimes include a comparison of the grain flow of the metal. Solid steel bar stock (center) is drop forged before machining a receiver to form the grain pattern necessary for proper machining (right). Receivers cast properly will form a grain pattern different than that of the forged steel bar stock but equally as machinable as the forged steel solid bar stock. -------------------------- Videos recommended for further visuals and learning: Ruger, Part I https://www.youtube.com/watch?v=ZBYw1CT2JiU Ruger, Part II https://www.youtube.com/watch?v=oriEUaJJEuU Ruger, Part III https://www.youtube.com/watch?v=PO4Lpr-mveA Lamothermic (casts new carbine receivers for Auto-Ordnance & Inland Mfg) https://www.youtube.com/watch?v=FS0uM3OC76I Pennsylvania Precision (non-firearm excellent presentation on investment casting) https://www.youtube.com/watch?v=wMzSS3BnMLs -------------------------- Credits: This article was prepared with the assistance of Ted Syme. Ted is a retired metallurgist who is currently a licensed gunsmith who specializes in .30 caliber carbines. |
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