the only barrel i have owned with sights is my 209X50 ml'er barrel, and even withthe tall rings i could not get the objective end of the scope above the rear sight, i took my rear and frontsight off and plugged the holes, this was with a simmons aetec 3.5X10X44 scope, i imagine with the qd's your wanting to be able to utilize both sights, wish i could tell you more but as i mentioned the ml'er barrel is the only one i have with iron sights