Absolutley SOP - with a fixed height rear sight, shooting and trying various height front sights is the only way to zero the sights to the gun. Much the same for Express sights - the standing sight is zero'd the same way with different front sights, then the leaves are filed for longer ranges.
Not sure I understand the tunnel, except maybe for strength. If the hole closest to the shooter's eye isn't smaller than at the front, there can easily be too much glare with such a sight.
That rifle just shouts quality, doesn't it.
-------------------- Daryl
"a gun without hammers is like a Spaniel without ears" King George V
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