Check here for IOR: IOR Valadada, Riflescope, Tactical MP-8 Dot, Snipers Hide
Scott at Liberty is very honest and knowledgeable. I just looked on the site and if I were you....I'd take a long look at the one at the top of the link 1.5-8X 26mm illuminated.
Also, after looking...it appears there's a new model of Pitbull....so what I said may no longer be valid. Scott will know....talk to him and he'll give you the straight skinny.