I have a Marlin 336 made in 1976. I am thinking about getting a peep sight to enhance the accuracy of this rifle. What brand/type of peep sight is easiest to install using pre drilled tapped holes on the 336 receiver? Also, I don't want to remove or mess with the front sight,if possible. I want to have a peep sight that is easy to install and adjust using existing front sight. I am thinking of either Skinner or Williams peep sight. Thanks for any inputs.