BCM and YHM uppers

[longrange18]

Do BCM and YHM get their upper receivers from the same manufacturer?

YHM upper

http://yankeehill.bizland.com/store/media/YHM-100_bg.jpg

BCM upper "borrowed" from hossb7's post in this thread. (https://www.m4carbine.net/showthread.php?t=38563)

http://i73.photobucket.com/albums/i231/hossb7/AR15005.jpg

Just wandering because they both have the same mark that looks like a "keyhole."

Brandon

[carbinero]

This is the most common upper I've seen. Keyhole is called Cerro Forge, IIRC.