Stoning and MIM ?

[TMan]

Okay, if my understanding of MIM is correct: they take a metal powder and Elmer's Glue++ mixture and inject it into a mold.

My question is: does this produce something that is only surface hardened, or does it contain the same hardness/density throughout the results?

OEM parts are readily availble for popular guns like the 1911, Rugers, etc. However, for something that is a little more rare, and it has a MIM sear, how badly would it honk things up by stoning the sear?

DA mentioned in a previous post that on the Wilson part you could see a circle with a dot in the middle, which indicates it is a MIM part. However, is this an industry standard for MIM parts?

["DoubleAction"]

TMan; The circle of the Wilson's MIM Hammer looks to be where the injection took place. This might be an all too familiar clue in what to look for on other MIM parts.
As far as stoning a MIM part, and because of it's pressurized resin bonding properties,I would think it would be hard throughout. Many manufacturers are using the MIM parts in their hammers and triggers, and many are honed to very light and smooth trigger pulls.

[TMan]

Okay, so are there parts that are just surfaced hardened or does that just apply to the colored case hardened frames.

["DoubleAction"]

TMan. It's mostly cast parts that have been surfaced hardened.