the only thing I don't get is the 14.5 inch barrel with pinned brake, it surely makes the gun easier to use if getting it in and out of cars like a patrolman would have to do, but 18 inches total length with brake cannot be that much worse.
Those BCM 14.5" barrels not only give you an advantage of being shorter, they're also incredibly smooth shooting. You have more blast than an 18" gun obviously, because it's closer to your face, but it's about as easy shooting as an 18" rifle gas barrel.
Getting a rifle out of a patrol car rack is a pain, because of all the other stuff in the car. But unless you go full on SBR, a pinned 14.5" isn't a huge advantage IMO.
