This has been discussed a few times in the last several months. There are many ways to mount a Aimpoint, and on top of the carry handle is the worst way to do it. It creates many problems and solves none. If you have a A1/A2 upper, goose neck mount is a great option. In fact, it is one of the best ways to mount an Aimpoint/dot sight. You retain instant access to irons and a standard cheek weld, you forward mount it which clears your filed of view makes two eye open shooting easier assists in quicker target focus and acquisition. You also get it low on the boreline making it easy to zero and keep in line with the flat trajectory of the bullet. Mount it on top of the carry handle and you lose all these advantages, create just as many disadvantages, and gain nothing.