Upper Receiver MFG Marks

[Jen]

Can anyone post or direct me to information to help identify the different manufacturers proof marks that would be on the upper receiver?

[MrGoodwreck]

This is the best I can find for now...


http://ar15.com/forums/topic.html?b=3&f=123&t=297440

[Lon Moer]

I wish they would "tack" that thread, over there. Or maybe over here?;)

[WolfsburgBob]

Excellent reference.

[Sharpshooter]

Jen,

I will be doing a upper receiver forge code thread for retro's in the retro section. The newer A2 stuff will not be included though. I will see what I can do for the current guns as I have a huge file containing forge code pics.