Unmarked "USGI" parts

[mchome25]

I see a lot of places selling unmarked parts (extractors, firing pins, etc) that they're claiming to be USGI unmarked...is the any way to tell if they're legitimately USGI parts and not commercial?

[meplat]

Comparison to the original specs, both dimensionally and metallurgically, is the only way to "really know".

[6 Ring]

Un-marked US GI carbine parts are not seen often and usually early. SG sears is an exception I can think of right now. To me, an un-marked carbine part would be a post war part or a new commercial part until I could verify the part.

[mchome25]

The post war USGI parts are the ones I'm seeing sold a lot...it doesn't bother me as I'm just looking at picking up some spare pieces but I'd like then to be at least quality GI parts!

[BobJ50]

You want to be careful who you buy your "Jenuwine GI Parts!" from. They may be from India, Pakistan or Taiwan. The only thing GI from those countries is Gastro-Intestinal problems.
There were legitimate overseas contractors and those are well known, parts often appear for sale in this Forum. Breda and Beretta come to mind.

[RDS]

Rumor has it some GI M2 unmarked cast trigger housing were made by a manufacturer on Long Island NY during the Vietnam War. I remember handling some back in the late 1980s and quality was good. Anybody have any info on them?