Non restricted, and you can use 100 or 250 round belts, as long as they fall in to the exempted type.
But it isn't cheap...Marstar charges around $2800 for the basic gun with just the bipod and shoulder stock...the tripod, T&E and pintle would run you another 1K.
You can get them in either 7.62 or 30-06 from the dealer. They are simple to convert back and forth with the appropriate barrel and cartridge guide, and if you come up with an 8mm barrel, you can easily convert to that caliber too.
Get some softpoint and you can go deer hunting with it.