My opinion is to go with something like a millet 1-4x24 designated marksman scope. http://www.bravocompanyusa.com/Millet-1-4X24-DESIGNATED-MARKSMAN-Tactical-SCOPE-p/millett%20dms%201-4.htm

You can dial it down to 1x and have no magnification for close shots. It'll be just like shooting a red dot. Then you have up to 4x for the longer shots. Millet claims you can use different parts of the reticle for range estimation up to 500 yards. Much better than using see-through mounts.