In modern literature often uses the term "Mosin-Nagant". This is a mistake. There is a separate rifle Mosin, and in a few exemplairs - Nagant rifle. It participated in the tender for the Russian army in 1891. The main reason that the Nagant did not win, was in the complexity of the bolt: it uses two screws. The article (she unfortunately in Russian) there are many images of both rifles, as well as early versions of the Mosin rifles
http://coollib.net/b/260854/read

Here are two rifles

Thanks Vashper. I have been guilty of such as well. Wikipedia has a good explanation.

Wow, there can be many examples of the Nagant in existence. Very interesting thread. Thanks!

The fact of the matter is that Nagant rifles were produced only 300 pieces. They can be seen in the Artillery Museum in St. Petersburg, and I don't know whether they are somewhere else. Perhaps in European collections you can find prototypes that participated in the Belgian tender in 1889. Then Nagant lost to Mauser.
From very beginning Mosin rifle named as "Mosin rifle", here French scheme 1912 (some rifles produced in France):