Instead of continuing the barrel break-in thread on new barrels and barrel technologies I thought I’d start a new thread. How many of you have heard of Bartlein Barrels. Mind you most of what I know is what my gunsmith has filled me in on and what I’ve read on their website. BTW, I have ordered a tight twist .308 barrel with 5R rifling in 11.27 twist for my AR-10 build. Link to Bartlein Barrels The folks who started Bartlein barrels were former barrel makers at Krieger Barrels. Not sure what happened or why they left and started Bartlein. What makes them different is the equipment used to make their barrels. It’s all brand new state of the art CNC equipment. According to my g-smith, most barrel makers are using equipment and technology that is 40 to 60 years old. It works well and they build great barrels, but the new Bartlein barrels are very different. What ever bore dimension and twist you want, they can produce. Here’s a quote from their website “The uniformity in our barrels and finish of the bores is second to none. Our rifling machines are so accurate, we can carry the twist rate to the 4th decimal point (example: 11.3642). The process of Single Point Cut Rifling is the most stress free way to rifle a barrel. The twist is exact; where as other forms of rifling can have variances due to the process they use. Also, the bore and groove dimensions are more uniform. We pre-lap our barrels before rifling and finish lap the barrel after rifling. There is no need or under any circumstances, should you fire lap or do any other sort of bore polishing to the barrel.” With this technology and machinery, they are on the cutting edge of developing new innovations in barrel making. I'm looking forward to my new barrel, as my g-smith said, there barrels are out performing all the other top of the line barrels he used to install hands down. Just thought I’d share!