I can say that Brick's flash hiders were pretty damn nice. My NFA moderators were also pretty damn nice too. That flash hider looked like the Bushmaster one, only worse. I started using BM flash hiders and cutting wrench flats on them. That wasn't good enough. So I started developing a flash hider, AKA non NFA moderator, based upon the Colt print. Some people would say, the real deal wasn't hollow. True, it wasn't. But you need to choose. Are you going to make a flash hider that is mostly solid steel with a narrow bore down the middle? Its just not necsacery unless your really making an NFA moderator. The design I decided upon had an internal flange to retain a captive blank firing adapter desired by a shop in TX associated with a bunch of Vietnam re-enactors. Speaking of which he was also the first customer for the TSI 607 buttstock! Thanks Trey. Anyway, lots of requests for alternate designs and such, but from a production standpoint you really need to choose one design and run with it. Unless you are overun with requests for change. Oh well, I geuss I will get off my high horse now.