[ARCHIVED THREAD] - Upper receiver question

Posted: 10/30/2008 12:31:22 PM EDT

What's this part on the upper receiver do? It looks like it's just there to collect carbon deposits.

http://i296.photobucket.com/albums/mm166/poofire/IMG_2943.jpg

Posted: 10/30/2008 12:32:20 PM EDT

[#1]

Might be there so the cam pin has a place to rotate.

Posted: 10/30/2008 12:32:59 PM EDT

[#2]

Its for the cam to rotate into when the bolt is home.

Posted: 10/30/2008 12:33:53 PM EDT

[#3]

Cool, thanks guys. I've always wondered but I guess I just didn't give it too much thought.

Posted: 10/30/2008 12:44:54 PM EDT

[#4]

I put my chewing gum there.