I'm accumulating parts for a .223AI rifle right now. Brux #6, 7.5 twist, fluted and will have it finished out at 24 inches with TBAC compact brake. I've got a Manners mini chassis stock and am just waiting on the custom action to arrive. Can't wait. I think this one is going to LRI for the build. Their turnaround time is tough to beat and their work is excellent.