Yet another question regarding Australian MDs.

[Anzac15]

I had posted a question a while back concerning Australian military districts, and completely failed to ask the one question that I meant to ask in the first place. Did MDs exist during the Great War, or after? And would a rifle manufactured during the Great War bear an MD marking? A purchase of a second 1917 Lithgow this past weekend has got me wondering. It is marked '2nd MD', as opposed to '2MD', and the info I am getting from other sources is conflicting at best.
Just wonderin'..

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[Bindi2]

Yes . 2MD and 2nd MD is OK