Comments on: Op 2 on the AR-180B selector lever https://gunlab.net/op-2-on-the-ar-180b-selector-lever/ Adventures in gun building! Thu, 21 May 2026 18:19:14 +0000 hourly 1 https://wordpress.org/?v=4.1.41 By: Chuck https://gunlab.net/op-2-on-the-ar-180b-selector-lever/#comment-10722 Mon, 01 Jun 2015 13:06:32 +0000 http://gunlab.net/?p=3567#comment-10722 Hello JB. They are design for both as a replacement but manly as a kit for the Nodak new aluminum AR-180B machined receivers.
They will have a case hardness of .005 to .010 deep with a 55 minimum HRC. I am having them commercially heat treated as this scope of work is a little out of my expertise.

]]> By: JB黒狐 https://gunlab.net/op-2-on-the-ar-180b-selector-lever/#comment-10720 Mon, 01 Jun 2015 08:45:10 +0000 http://gunlab.net/?p=3567#comment-10720 Owing to the methods employed to manufacture the AR180B I am guessing the investment cast fire selectors were not case-hardened.

Are your fire selectors intended to replace worn out investment cast fire selectors or parts for new AR180s?

Either way, a case hardened shaft should make for a long lasting component.

What is your intended method of case hardening & what HRC numbers are you trying to achieve?

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