Cold Drawn Alloy Steel Gas Key for the Firearms Industry

REQUEST QUOTE Cold Drawn Alloy Steel Gas Key

Rathbone Precision Metals, Inc. manufactures this gas key profile configuration for the firearms industry. Our cold drawn process is tailored to provide dimensional tolerances of ± 0.001” on the width of the base. Although our standard cold drawn surface is 125 µin, most of our customers purchasing this profile require better to reduce their in house finishing operations. Rathbone responded to our customer requirements by designing our process to achieve 63 µin Ra maximum on the entire profile. We have pushed our surface finish capabilities even further when asked to so by designing a process to provide a 43 µRa maximum surface finish of the bottom flat of the base.

We produce this profile in 4140 Alloy Steel and then supply to our customers in either 12’ bar lengths or in abrasively saw cut to exact piece lengths with a tolerance of ±.010″.

This profile when compared to machining from rectangular bar reduces scrap loss, improves throughput, and reduces manufacturing costs for our customers. .

To learn more about this profile as well as others, or how cold drawn and cold rolled profiles could benefit your application, please contact Rathbone today.

Cold Drawn Alloy Steel Gas Key Project Highlights

Product Application

This Gas Key profile is used in the AR 15 and many similar platforms.

Capabilities Applied/Processes

Die design to provide better than industry standard dimensional tolerances and surface finish. Abrasive saw cut pieces or 12 ft exact length bars.
Profile symmetry is maintained while holding consistent fillet and corner radii.

Customer Benefits:

  • Provides improved surface finishes that reduce or eliminate in house finishing operations.
  • Accurate profile symmetry.
  • Abrasive saw cutting of exact length pieces.

Overall Profile Dimensions

Width: 0.400”
Height: .500”
Length: 12” bars and or exact length pieces


Flat on base: 0.400 ± 0.001”
Height: 0.499 ± 0.004”

Material Used

4140 and 4130 Alloy Steel

Max Surface Finish

63 and or 45 µin Ra

Estimated Profile Weight

.5019 lbs per ft

Industry for Use


Standards Met

Per Customer Supplied Specifications

Product Description

Gas Key that is sometimes referred to as a Key Bolt Carrier.

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News & Events

  • Lead Times Extended 2 Weeks

    [July 12, 2021]

    If you recall, in my last blog, I advised all that Lead Times are on the rise and to get your orders in sooner... Read More

  • Waiting only makes it worse!!

    [June 2, 2021]

    The talk of the town last year at this time was the Covid Virus and while it is still a topic, supply chain/logistics issues... Read More

  • Challenges of 2021 Continue

    [April 12, 2021]

    While the 1st Quarter of 2021 has come to a close, the challenges of the cold work industry continue. The costs of raw material... Read More

Companies Represented by Rathbone