Guys thank you for all the Birthday Wishes! GNXZ its a Eotech 552 and it has served me well for over 4+ years. I did have a problem with corroding batteries and had to get a kit from eotech to address the problem. I would recommend the new Eotech XPS-2 if you are going to go that route. Cheek weld is pretty high, but you will adjust to it....nothing like having that red circle floating in space.