With Nazi proofs(if they're legit)it might be better to spend the bucks restoring it. For a barrel if money's no object I'd go with Krieger. They have shallow rifling which gives better accuracy but the trade off is they don't last as long. You can pick up a bolt and sights at Numrich
www.e-gunparts.com
Why a match grade barrel and no scope? Kinda defeats the purpose.