I recently finished these up. I have an 18" .308 AR that is a tack driver and wanted to build one like it in .223 . The SASS barrels are pretty heavy, but they are very accurate. The Blackout was BigAl's idea, he was wanting to build one and put a suppressor on it...so I figured I build one too. I had a couple Spike's Tactical lowers laying around and this is what I came up with.