If you are considering buying used I happen to have a DPMS 24" SS fluted bull-barrel complete upper with JP VTAC handguard (rifle length) that I'd be willing to part with. It has less than 500 rounds through it, none of which were surplus ammo or metal-jacketed. I'm willing to part with it because my wife is only going to let me have so many configurations, and I'm wanting to do my own build. If you don't want to buy used, I see all kinds of them on Gunbroker.com if you want to check them out, but they're just one of a ton of places you can buy DPMS-compatible complete uppers. On a different note, nice rifle, and welcome to the forums!