I am looking for a close combat optic for my AR-15. I like the M68 that I used in the military and would like a something similar. At the moment I'm not looking to shell out more than $300. I would really like the Aimpoint COMP M4, but that comes with a price. Is there any other optics out there that are similar with a much lesser cost? Or should I save my money and wait until I can shell out the $$$$ for an Aimpoint?