[2336USMC]

OLY proof mark

Digging deep into the old posts, trying to learn more than I know, which isn't hard...MCORPS1
Just to clarify, what exactly is the OLY proof mark? I have a USGI Harris Graphics NM barrel with this mark. Does this indicate that Olympic Arms bought these barrels, did their own proof testing and then distributed them?
Thanks!

 

[2336USMC]

Thanks Different

This one still doesn't seem to fit that situation:

 

[2336USMC]

Hmmm, can o' worms...
Thanks for the reply.
FWIW, I got this barrel from Fulton in 1989. I was thinking about replacing it because of tooling marks in the chamber, and tooling marks visible on the surface of the lands, but it looks good otherwise, and headspace is tight, so I decided to shoot it for a while more to see what it can really do. If it's safe and groups well, why replace it?

Edit- I was wondering about the arrangement of the stamping. The 20084 at the end led me to assume harris graphics, but what's interesting is that at the start of the stamped marking where the maunufacturer would normally be indicated, there is a blank, followed by a dash, then the part number. Why follow a blank with a dash?

Maybe Harris Graphics got a small GI contract, then just kept the machinery running and wholesaled the extra barrels out (ie to Fulton), the blank space followed by the dash could have been for their wholesale buyers to fill in with their own stamped marking.

Just guessing, but I've never seen another case of a government contract part of anything with a blank space followed by a dash.

 

[2336USMC]

Markings removed

Upon closer examination, the original stamping at the start of the string was ground off this barrel. If you look closely at the photo in my post above, you can actually see it. I highlighted the markings with a wipe of talcum powder, and if you look in the area where the "OLY" is stamped, you can see that the original tooling marks from the lathe are gone- the talcum powder didn't stick in the machining marks there. The slight deperession in that area can be felt with a fingertip, and a straightedge also shows it.
So what did they grind off before the "OLY" stamping was added?
Is that where it would originally have been stamped "SGW", or something else?

 

[2336USMC]

Got it!

Thanks!

 

[2336USMC]

Reposting the photos since the links are dead and this thread was referenced in another thread: