Can I get a 7.62x51 NATO Convershion kit for a 308 fn fal?

I want to get a 308 fn fal made by DSA for 999.95 and I want to know if I can get a convershion kit so I can fire both types of rounds when I want. How does it work exsactly. Can I fire a 308 out of a 7.62x51 or is it the other way around. I want it to be as veristial as it can so I'm not just limited to one type of ammo.