Originally Posted by
Eric D.
I like the midlength government profile. It doesn't make sense from an engineering standpoint but the fact is I just don't like the look of lightweight barrels. I also believe there is merit behind a 0.750" diameter under the fsb. For the most part, the taper pin holes are arbitrarily located. My BCM middy has a full 360 degrees of hole through the barrel where it was drilled for taper pins. I've been told that the pins are not to pass into the barrel more than half of their diameter. Having put almost 1500 rounds through that upper, I'm pretty sure its just fine. The point is that when going to 0.625 diameter, there is a lot less wiggle room for where the holes are drilled.