Originally Posted by sconnyhunter

You're in the Navy? Thank you for your service.

Now, go talk to your company armorer.
They will have a better idea than most what rifle to get. Second, they may be able to build you one, from the ground up.
Or, maybe better, since the Navy and Marines are nearly inseparable. Talk to a Marine armorer.
They military has some of the best weapons knowledge in the World. Most armorers, if they can't find or build what you want. Will know who to talk to, to get the job done.