Need help with weapon I.D.

I have a chance to go to GUNSMITHING SCHOOL. And if I can come up with the identity of this weapon. My tuition will be paid. I don't have the ability to put picture on here. But can E-Mail picture to someone willing to help. Mainly need to know the name of the possible conversion kit upper. Looks like a 9mm. With possibly a top feeding magazine that may swing out to the side when ready to fire.
If you could help with identity. It would be greatly appreciated!