"You can empty a 30 round mag on an AR full auto and still put your hand around the barrel" - author on Teludyne Tech Straightjacket. The Teludyne (TTI) Tech Straightjacket – Extreme Accuracy Makeover This looks extremey interesting... It called into question some of my thoughts on accurizing a rifle. Well worth the read!!
A BBL is made from the same metal composition as the entire barrel. This procedure is using a more heat conducting set of metals than the barrel. That's the big difference here. It's not just a BBL. It's a BBL that sinks heat faster keeping the barrel cooler and helps with the irregularities of the barrel becoming more apparent as the barrel heats up.
That's what I got from the article too. It appears that it's impossible to make a barrel perfectly concentric and then create a hole perfectly down the middle. Thus, variation in temperature creates a different point of impact -- wider variation typically equals large spread. Therefore, reducing the temperature range of the barrel reduces the point of impact spread. I thought I read that it added 3 pounds to the rifle.
