Traditional centre hold sight recommendations

[Infanteer]

Hi all,

I hate the sights on my g and g CM 16, I have a holographic sight on there right now but I want to swap out the regular sights which comprise of the front rail popping up and having a jagged w shape to it and a pillar post at the back with a ring that you look through and line up with the middle of the front sight. I have to muck around a bit to sight these in and also target acquisition because of this set up is not optimal. What I am looking for ideally is a simple old school open sight/ set up, specifically either a patridge sight or failing that a V notch and post set up. I want to get away from the ring as I am not a big fan, I had one on an old rifle of mine and it was fine but that was for target shooting at reasonable ranges. I got my local store to have a look for me in their g and g catalog but could not find anything. I don't want something that will cost the earth, its a pretty simple set up I aim to run and it needs to fit on the rail. Any suggestions would be appreciated.