Here's a similar thread, with other options, ([url]http://www.ar15.com/forums/topic.html?b=3&f=118&t=155421&w=searchPop[/url]) but IMO, ya got the one of the most accurate ARs already, the [b][red]CR6724[/red][/b], (follow my second post there, to find a load for your rifle, which I know for a fact will shoot in it, w/ come-ups out to 1000 yards).
Hope this helps,
Mike