Ive only shot a 16" BCM and if memory serves it shot well, but I didn't use it in any type of precision shooting such as groups or anything. With that said for no more than these Larue barrels cost new I cant see myself even trying another brand..
I have a 14.5 inch BCM and just got a 4-14 power optic. Next time I go to range Im looking forward to some accuracy testing