On Mon, 18 Feb 2013 20:47:36 -0800, Gunner
wrote:

On Mon, 18 Feb 2013 20:38:18 -0600, Karl Townsend
wrote:

I'm "reverse engineering" a two part FN30 rifle trigger:

http://www.mwdropbox.com/dropbox/trigger1.jpg
http://www.mwdropbox.com/dropbox/trigger2.jpg

What tool steel and temper would be best for this?

Id say 4140. Or O-1

Gunner

I'd worry about that little projection on the top piece, right where
it joins the main part of it.

There's going to be a lot of residual stress there when you quench it
in oil. Square shoulders with vastly different thicknesses are a real
problem.

However, I don't know what I'd use as an alternative. Going to A-1
might do it, but I don't know.

--
Ed Huntress