1920 .30 cal DWM Luger?

[DonVoigt]

Originally Posted by Chickenthief

Huh?
I can asure you that my 1921 (i series) is in original state and it has a blued muzzle. Why would they blue the barrel and then polish the muzzle?

Why,
because that is just what "they" did.
Perhaps the same reason that the inside of the frame was protected during the rust bluing process?

I don't take pictures of the muzzle of my lugers when documenting them, but a quick look in Still's Weimar Lugers shows several pictures with the muzzle clearly showing polished.
The ones that are not polished are "re-worked" and usually have the 1920 PS added.

Others can weigh in on their observations.

Feel free to post pictures of your 1921 or add a link so we can see it- better yet start a new thread about your question.