Anyone know anything bout these AR15's I've been thinking about getting one and this was in a local ad

Olympic arms AR15 A2 223 cal 16" barrel flash hider hard case & papers $600 accessories available

You'll probably receive a ton of posts from folks who say their Olympic Arms are top notch, but most AR nuts consider the Olympics inferior. Go to some of the dedicated AR sights like ar15.com and m4carbine.net and you'll find the Olympics have a fairly poor reputation.

Never owned or shot one, but I agree that they really do not have a great reputation. For another $200 or so, you should have no trouble getting into one of the more reputable names in the AR game.