Hi Ed,
An East German Mauser is a shooter because it has 0% factory original Mauser bluing, even if all the small numbered parts are original to the gun.
Now if you are asking, why this isn't considered a collectable re-work variation, that is probably because it is post-world war II. I'm not aware of any post WWII collectables except the HKs from all-original parts.
Jimbo
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