Upper receiver manufacturer symbol

[ussbang]

I noticed a small symbol on several upper receivers on varying gun makers new production rifles in the last two weeks. It looks like a small raised key hole design.

Who is the actual manufacturer?

I have been told that most of the current firearms companies use the same sources for parts and after seeing this I am starting to believe it. I saw the same symbol described above on a Stag M4 varient, a S&W carbine, and a Colt 6920.

[Robb Jensen]

It's a Cerro forging. Good forgings used by many companies. Who knows on the finish machining and anodizing.

[AirNavy]

Now I can say I learned something new today. Thanks guys. They even have a picture of an AR upper forging on their website: http://www.cerrofabricated.com/Markets_Firearms.htm

[Shihan]

Read and you shall become the forge marking guru

http://m4carbine.net/showthread.php?t=5357