One thing to watch out for on the No1's is the quarter rib.

Their needs to be a gap (a few thou is ok) between the back of the rib and the action. If their isn't a gap as the barrel heats up and heat is transferred into the rib and it expands it can have a costly affect.

Its a similar affect to those who wish to bed the first few inches of their barrel around the swoop.

Most of the factory Ruger ribs are ok but I have come across a couple that were butted up on the action.

Tom.