My 2014 BCM with a 14.5 BFH was a solid 1.5" @ 100y rifle. Latest BCM (an FSB 14.5 BFH) is around 3" at 100y.

For comparison; I have a Colt SOCOM barreled upper with a 13" MCMR that consistently shoots 50-5X on a B-8 at 100y with 62gr Magtech.

I love the MCMR handguard, but will not be purchasing complete BCM uppers as I can get a more accurate barrel elsewhere.