I use a cheap $60 Simmons Pro-Diamond 4x32 shotgun scope with a diamond reticle. For a cheap scope it has clear optics and holds zero well. A lot of people will probably laugh when I post this but oh well. I have it on my Z5 Omega .50. I would like to have a Nikon but can't throw out the $$$ for one right now. Besides, like I said the Simmons, even though inexpensive, has worked really well for me.