Saturday I spent most of the day finishing up the second op on the selector lever. Here is a run down of that operation.
Starting with the finished op one part.
A special set of aluminum jaws were machined to hold the selector levers.
With the jaws finished and the parts installed this is how it looked prior to machining.
Two sets of vises were used allowing 4 to be done at a time.
This is the video of the parts being machined.
A close up the finished machined part still in the vise.
Start to finish of this operation.
The completed lot.
One more op to go then tumbling and parkerizing.
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?
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.