Some people are going to be critical no mater what, but here is a simple peep made from a 10x32 thumb screw. It is very sturdy and unobtrusive, few people even notice it until they shoulder the gun.[url]
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Windage is adjusted by drifting the front sight. Elevation is by turning it into or out from the hole drilled and tapped in the tang. Exact elevation changes depends on the sight radius but with the common 28" barrel, 1/2 turn gives a change of about one inch at fifty yards, two inches at 100.
The jam nut to lock elevation is a "forend nut" from a set of sling swivels and finger tight is adequate.