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"Active corrosion should not be acceptable on any firearm."
As a former USMC 2111 I agree totally, HOWEVER, I attended a short 2 day curating seminar at the Winchester Museum in Cody WY 3 years ago...

Other than the last 2 digits of the original rifle serial number, there is no purpose.
But where has it been? Someone in a small foreign armory/ROTC/cadet, etc, may have stamped the last 2 digits...

What does it not do?
Is the last round going towards the chamber, or does it angle off to one side? If the follower spring is from another type weapon, it can make it nosedive or angle up. From what...

BATF time?
Sunday PM I received word they already know about it.

Email with link to this post was sent out, we'll see if anything happens.

I actually know a new BATF agent in Boise, think I should give him a heads up?

Your WW1 cartridge belt has been dyed, possibly during WW2. They were khaki colored until 1943 when all field equipment went to the darker O.D. shade.
I have a really nice 1918 belt, wish mine had...