Rough finish: As I remember the story when we first got them, Gary rushed the first barrels for testing to Quantico and didn't have time to polish the outside after contouring. The guys running the test rifles loved the finish because as mentioned above, it held paint better and had less shine in an FFP, and requested the production barrels to have the same.
In the FMF, we loved the Schneiders for this trait. The barrel was a bitch to keep the shine down beforehand and was the cause of more than a few "busts" on stalks. I made a point of sending Schnieders to school with my PIGs when I was Chief Scout, they needed every edge they could get to make it through.
Frank, are you going to run a 12 twist? I've always thought about putting a 10 twist on mine because one, neither I nor anybody else would ever know the difference looking at it and two, I'm never going to need the ability to delink and shoot 147gr machine gun ammo. A 10 twist just shoots 175 SMKs better, and no offense to Bartlein as I love your barrels but if I'm already straying from an original manufacturer of M40A1 barrels, I may as well stray from twist rate while I'm at it to something that shoots better. If a clone correct critic gets on me for it, I'll tell them to go find a fucking pole. IYKYK.
Either way, put me down for one.