Someone local has an AR upper listed for sale as a "Colt AR15A2". There isn't a lot of information given and the pictures aren't that great. The upper receiver appears to be a "C7" type with A1 rear sight, forward assist, Brunton bump, black finish, and CK forge code. The barrel is listed as being 1:9, is 20", has A2 handguards, and looks to be A2 or heavy profile. It doesn't come with the bolt or charging handle. I tried to do a little research but only found out that "CK" is Colt/Kaiser. I'm guessing that the 1:9 barrel isn't Colt. The price seems decent and I'm thinking about picking this up, does anyone have any thoughts?