Correct on both counts----One Piece, and Larger Screws. Oh, and yes to steel. I have two Rem-700's, both with one piece rails, one in 30.06, and one in 338LM, and the rails do not get in the way at all. My gunsmith actually welded the rail onto my 338LM to add even more strength---you want to be sure to have the right base if you do this. I actually shot a scope off on my 30.06----It was on a two piece rail, and the screws sheared off on the front mount from recoil, and the scope fell of on the bench. The one piece rail helps with all four screws working together to hold the rail. Also, the one piece rails seem to have a better recoil lug on them.