OP slide numbers and little hole on bolt??

[trekvana]

Hello all,

I noticed there is a little hole on my carbine bolt (round type). Anyone know what the purpose of this is? Also my op slide doesn't have any markings (which leads me to believe it is a commercial USGI spec repro) but it does have a long list of numbers located on the outer flat bottom of the slide - one 7 digit phrase and one 5 digit phrase. Any ideas as to what those numbers imply or are there for? FYI - the carbine I have is a Plainfield paratrooper model.

thanks
geo

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