Keep in mind, the difference between a $600 and an $800 dollar rifle is actually quite noticeable. I would look at an entry level Stag or Rock River. If you can handle pushing two pins out and back in, you could buy a complete lower and a complete upper and save $100. The Double Star lowers get good reviews on here, but I don't personally own one. I think I've seen their complete lowers go for around $210. You can get a complete Rock River upper for around $450. So, for $675 or so, you can get a much better gun than an Olympic Arms or similar $675 gun.