I had some dialog with these guys today. Ballistic Advantage LLC We do provide 308 barrels for the AR platform. We stock DPMS style barrel extensions with broached lugs. We have the dimensions for the use of an Armalite extension if the customer provides one. We are currently building our inventory so we can sell more from an in-stock basis but we are still providing custom barrels made to order as well. Our next steps for the 308 platform are to start providing 22-250 varmint barrels followed by 243 win and 338 fed. We offer standard chrome moly, match chrome moly, and match stainless. Chrome moly barrels can be parkerized or melonite coated and stainless barrels can be provided bead blasted or IonBonded. We turn our barrels with gas port locations that allow the use of AR15 gastubes (carbine, midlength, intermediate, and rifle). We also are just starting to offer dimpling as well as fluting. We offer lengths from 10.5" to 22".