That rifle is awesome and if it was mine I'd put a Marbles Bullseye rear sight on it.
http://www.midwayusa.com/product/18...ble-step-elevator-338-to-535-height-blue

It's an aperture sight that's faster than a peep sight and it doesn't block any of your target. Your eye will naturally center the front sight in it. These are Marlbes best invention imo.