RRA AR-15 .223/5.56 semi-auto. It has a 16" barrel, Yankee Hill rail, Yankee Hill flip sights, RRA's awesome 2-stage trigger(this trigger has a much lighter pull than stock 2-stage), Magpul grip and very hard to find, maybe rare now, Magpul M93B stock! Older listings I've found for the M93B stock alone shows it selling for $300-$400 by itself. Overall, the rifle is in great condition and low round count.
$900 firm in all cash, no less. Or will separate, $500 for the RRA lower with M93B stock and $500 for the upper.
Must be legally able to own a firearm in TX and have valid ID.