5.56 NATO. Which is pretty much the same round. Still need to buy sights or some sort of optic. Then a free float quad rail fore-grip. Then I'm upgrading the internals. Eventually I'm going to swap out the upper for either a piston operated upper or a AAC 300 Blackout upper.
For those that don't know, a 300 blackout upper allows you to fire 300mag rounds from an AR-15 platform. With a swap of barrels, you can fire 5.56/.223 rounds from the same upper.