AR Upper ID?

[Batteriesnare]

Hey all,
Picked up my first AR over the weekend, thought it was all built by Double Star, but after research and calling DS, I've found I have a pieced together rifle. The biggest puzzler to me right now is the manufacturer of the upper receiver. It has this marking stamped on it behind the shell deflector, but I can't ID it anywhere. Does anyone know who made this? Thanks for your help!

[ChunkyMonkey]

Did I sell that one to you? Are you a drummer? If you are, I still have the twin of that rifle and probably can find out more about it. Welcome to the site!

[Batteriesnare]

Alas, it is I. I'm curious to find out what the rifle is made from, especially the barrel/chamber. There are no markings or engravings anywhere on the barrel, even under the handguards.

[ChunkyMonkey]

PM sent..and probably will get more info on it tonight. Small world aint it.

[Batteriesnare]

PM replied to. I appreciate the help!