Just for [bleep] and giggles, I'm going to take a flier and try the Black Hole barrel with polygonal rifling. Locally, they have a fantastic reputation for being crazy accurate, a breeze to clean (no rifling edges at all) and FAST.
Steve
Keep us informed on the performance of the BHW barrel. I have a 16" on a Wilson upper that I have not shot yet but I hope to get it out in the next couple of days.
