Actually, having used both the Lymans (old vintage) and the Martini, I would say their qualities are quite comparable - though neither quite in keeping with the rifle that you are creating. The Martini I had was a club competition rifle and actually far more repeatable than a Lyman as well (a critical feature in my mind). But either way, what I was really getting at was the means of anchoring the sight to the action, not the sight itself. What you have will certainly work though. It's a great rifle.