The eotech 556 Is an excellant weapons sight. It has NV mode and has the side push buttons for easy access to them. I mounts to your ar style weapon in seconds. Very user friendly and has 20 intensity settings. The sight is rather lengthy, so if your worried about rail space you may want to upgrade to the EXPS-3 which is the same as the 556 except a lot shorter. It may be worth the few extra dollars if rail space is limited. Over all a great sight
Pros: Nv Compatible, Long battery life, Side Buttons
Cons: overall total length
This review was written in the old system and had content requirements that are different than reviews written today.