The Weaver 49045 is designed with wide top straps to stably hold zero irrespective of extreme recoil. The convenience of switching to iron sights within seconds is possible with just a loosening of the thumb nuts. Once you remount your scope, it immediately reverts to zero.Furthermore, this model features detachable extension top mount rings. This functionality allows you to adjust the position of your scope 3/4\" either forward or backward to secure the perfect eye relief.