I would first ask what is wrong with the factory sights? I had my factory sights replaced with a Millet set (new staked front sight, adjustable rear that uses the existing dovetail and locks in place with a set screw.) I chose the Millet set because it didn't require milling a dovetail for the front sight.
They work well but if I had it to do over I would have stayed with the factory setup.
Treason doth never prosper, what is the reason? For if it prosper, none dare call it treason.