The front sight on my Zastava 458 win mag is not well machined and it's glued to the barrel so I just ordered a NECG Masterpiece banded ramp with an inside diameter of .689" http://www.newenglandcustomgun.com/Gun_S...20Banded%20Ramp the tip of my barrel have a diameter of .692 (see pic below) what do you think .689" is a good choice for the barrel?