Exotic Rifle Showcase

I'm currently working on ways to be a better modeler with guns. I've been getting feedback from other sources, watching some  videos on better techniques that have been helping a lot. But the more feedback I get, the more I'll improve. This is what I've got from the end of the day yesterday. Beforehand I had was modeling weapons with about 30,000 polys and was suggested to cut that down. So I'm wondering, what would be a good polycount budget for weapons, especially for an FPS game title? Any help would be greatly appreciated. 

The current polycount on this is a little over 6k. And still blocking things in and refining as I go.