L1A1 wood hand guard differences.....

[82Trooper]

So my rifle is safe and sound being diagnosed by Brian Dick. Knowing the rifle is in his capable hands, has freed my mind (from solving my own problems) to wondering about unimportant stuff....
Like what is the proper application for these hand guards? One has metal trim on the exterior of the front tip , one is all wood on the outside.
What gives?
And while I am at it....what is the "proper" finish for the metal butt plate cover assembly? Almost every one I see is silver, with no finish rmaining. How did the leave the factory? Blued? parkerized? painted?

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