I used 10.5 NEA barrel, and despite what some opinions are on NEA parts, the barrel is great, in stock, and reasonably priced. If you have the $ then an Ultramatch would be nice but they arent usually in stock all that often. At 10.5" you also aren't going to get extreme accuracy, so you could argue a .223 Wylde ultramatch might be overkill. I saw a vendor on here a month or so ago that just added a whole bunch of barrels that came in, can't remember which one though! Good luck, they are super fun to shoot!