Where did the term DAO-12 come from?

[MoviePropMaster2008]

Originally Posted by Yournamehere

DAO-12 is what it's called in Battlefield 2, but I don't know where they got it from...

Edit: it has a DAO (double action only???) trigger system, so that's why they call it a DAO-12. It's still not correct terminology.

I saw it from time to time on IMFDB, don't remember in what context, but I'm starting to see it again. On other forums, someone just 'corrected me' by stating that the gun is called the DAO-12. I finally challenged that and said "What are you talking about?"