Update: i did use the UTG bug buster scope it fit perfectly with out removing the rear iron sight.
I test fitted a few scopes i had and this one worked the best, before i sight it in i think i might pick up a fixed power scope in the same size to see if i like it better.
Eye relief is where i was having problems with other scopes and a 40mm would require me removing the rear iron or get taller rings.
I wanted a short scope mounted low almost like a pistol scope and the only one that fit the bill was the Bugbuster that i already had.

Now i am down to 2 guns i want a 308 and a 50 bmg and maybe a few more hand guns