Agreed^^^ you'll always want to check headspace and 700 barrels have to have the shoulder turned in a lathe to set headspace.
But if your going to go with a Remage barrel, then you can set headspace yourself. The stock may need to be clearanced to allow room for the remage barrel nut.
A recoil lug of different thicknesses can also help get you close to your desired headspace. But it will still need to have the shoulder turned down a bit most likely. I like the 700 recoil lug better than the old 600 Mohawk "humped" lug.