As you remember, there was another FN F-2000 model on the old screenshots.
The reason GSC changed it is that it was only prototype design. Serial type looks like this:
But now, Z.E.N. resurrected this model, revised it's animations and added working GL. Only difference is that the old texture doesn't suit to this model due to problems with GL - texture doesn't affect it.
Model/base texture: GSC Game World
Warning! Do not forget: there's no such weapon in the original game. In order to play with it, you need to use test spawn script (included in the archive) or ask the mod authors to implement it in the future releases.
All releases in this category must contain (at least) the test spawn script. It can be found in gamedata\scripts folder and allows you to get FN F-2000P from Wolf after the first task briefing.