I'm a new member and I just bought an AR-556. I just ordered a Bushnell AR Optics 1-4x 24mm Riflescope and I need to buy a QD scope mount. I'm been looking at an American Defense or a Burris PEPR QD mount. I'm not sure how high a mount I need to see past the front sight. I'm open to other recommendations for a mount. Thanks.