BCM is a good company with great customer service. Paul and his people will take care of a problem even if you bought the rifle used. I own three of the 14.5in mid-length uppers. They are, hands down, my favorite non-NFA rifles. The mid-length gas system shoots a bit softer than a carbine length and the barrel length is as handy as you can get without shelling out $200 to the ATF. It's a good buy.
Mick-Boy
"Men who carry rifles for a living do not seek reward outside the guild. The most cherished gift...is a nod from his peers."
nsrconsulting.net
I cant decide, I have been wanting to do a build with Noveske upper/lower with an 18" mid. But the BCM is nice and a lot cheaper.
I've got two BCM uppers- excellent products- one is a 20" Gov't profile, the other is a 16" mid-length. Not a hiccup in either one since round one.