So I got this upper and it was sold as a BCM upper. It's 11.5" a heavy barrel, marked " B MP 5.56 NATO 1:9 HBAR". My research and knowledge says it is a Bushmaster upper. The FSB is not "F" marked and there is no "BCM" on the right side rear of the receiver. The Upper is a "keyhole" upper and both of my BCM uppers are the broken "A" (Anchor Harvey?) forge markings. Has BCM ever used "keyhole" forgings?

MM