dw razorback 10mm (a bit modded)
Actually, there is a HUGE difference between MIM and Investment Cast.
It's an Apples To Oranges comparison since the best quality MIM only has about a 95% density.
Ed Brown parts are not cast - if anything they are finish machined from drop forgings or precision laser cut from tool steel billet stock.
The Brown hammers, firing pins, ejectors, extractors etc...are hardened/heat treated then cryo-treated machined from tool steel.
There is only one place making 100% fully machined from bar stock 1911 parts such as a fully machined slide stop, thumb safety, disconnector, sear, magazine release, etc. and that would be Evolution Gun Works.
It is very possible that EGW is now making some parts for both Brown & Wesson.
So in order of Part Quality from Best to Worst it would be in this order.
> 100% Machined From Bar Stock being about equal to:
> Finish Machined From High Quality Forgings
> Finish Machined From A High Quality Investment Casting
> High Quality Investment Casting
> MIM (Metal Injection Molded)
Nothing Ed Brown or Dan Wesson is MIM. BTW.
#1 Kimber Compact
#2 Colt XSE Ghost Commander
#3 Springer Loaded
OK I'm looking in the Brownell's catalog right now & I stand corrected. Actually I am sitting corrected rather than standing corrected. :biggrin2:
The "regular" Ed Brown S Stop is described as: Hardened Tool Steel but, does not specify forged or cast.
The Ed Brown HARDCORE SLIDE STOP has the pin Machined. & I'm assuming is also fabricated from Hardened Tool Steel since it's priced $9 higher than the other..
It's the WILSON BULLET PROOF that is fully machined from barstock. Whoops!
(and it's probably made for Wilson by EGW) (guessing)
The ED BROWN MATCH EXTRACTOR is machined from tool steel.
The BROWN Firing Pin is Machine Turned From Tool Steel
Ed Brown Firing Pin Stop is: Machined From Heat Treated Alloy Steel.
Ed Brown Ejector is described as: Machined From Hardened Steel.
The Ed Brown Hammer & Sear are "Investment Cast Tool Steel Cryogenically Treated."
Ed Brown Disconnector is Investment cast tool steel then finish machined then hardened/heat treated.
My other best guess is that ALL grip safeties and mainspring housings (by all makers) begin life as high quality investment castings.
nothing wrong with cast parts. Heck para casts their frames and slides.
Speaking of Para... here is mine.
Thanks for the info. QK.
I really like the quality of Ed Brown parts.
Though I admit I would like to see the EGW parts up close and personal.
The Brown precision parts are just so doggone good that I really have a difficult time believing that "fully machined from bar stock" could be anything much more than just higher cost.