So I'm sure veryone that owns a black rifle has plans for the next one. I've been thinking on mine for a while and have a few variations in mind. Above all though I would like a short, light AR for close range/fun. I really like retro stuff too. In order to cut down on having 8 diff AR's I've discovered I can have the shorty and retro all in one sweet package I've been hunting for a while on some details about the shorty little air force model carbine. I finally found this site, specifically this page: http://www.retroblackrifle.com/ModGde/CrbGde/607.html They have a ton of info on this site and it's great to see all the details of diff generations and variations for these rifles. Now that I know exactly what it is I'm looking for, I'm totally planning a 607 build next!!